The real name of "the" Bill Gates is William Henry Gates III. 
Nowadays he is known as Bill Gates (III), where "III" means the 
order of third (3rd.)

By converting the letters of his current name to the ASCII-values 
and adding his (III), you get the following:

B       66
I       73
L       76
L       76
G       71
A       65
T       84
E       69
S       83
+        3
--------------
       666 !!

Some might ask, "How did Bill Gates get so powerful?" Coincidence? 
Or just the beginning of mankind's ultimate and total enslavement???

YOU decide!

Before you decide, consider the following:

M  S  -  D  O  S     6  .  2  1
77+83+45+68+79+83+32+54+46+50+49 = 666

W  I  N  D  O  W  S  9  5
87+73+78+68+79+87+83+57+53+1 = 666

Excerpts from The Prophecy Puzzle

This is definitely the age of the computer. Computers do all kind of wonderful things, but, because of the way they work, everything they do must be converted to numbers. Every letter on this screen, every colored pixel, every tone produced by the computer (including your favorite music CD) is saved and processed as a number.

Now that modern technology has reached the stage where it is truly feasible for Antichrist to exert economic dictatorship it is increasingly important for everyone to have a distinctive number. Most of us have several numbers already: our Social Security number, drivers' license number, phone, FAX and pager numbers, credit card numbers, and so on. See Modern Technologies.

What does Antichrist's personal number, 666 mean? Please notice that the Scripture says plainly that it is "the number of his name." This is significant because the issue in this future story is that of worship. People must vow their devotion to this worst of all the false Christs by allowing either his name, or else the number of his name to be placed on them in a prominent place as a symbol of their allegiance.

There are many possible ways of converting a name to a number. Here are some of them:

Assignment
This is how you received your Social Security number, or credit card numbers. When it was time to be "numbered" the next number in a sequence was assigned. Some systems pick numbers randomly instead of sequentially, and check to make sure no one else has that number before issuing it.
Choice
This is the process if you, or someone else, should choose a number to represent you. This is sometimes done for jerseys of famous athletes. Other examples of this are when you order a personalized license plate for your car or pick your own phone number.
Conversion
Returning to the fact that our lives are run, or at least monitored, by computers, there is another way of deriving a number from a name. There are several different numbering systems used by computers to convert any given letter to a number. One of these is the ASCII code (A=65, B=66, etc.) Using this system, and adding up the total of the values of the letters, it is interesting that some names do add up to 666. Some famous names produce this result.

Another type of conversion is based on the alphabet (A=1, B=2, etc.) Such a system would not produce a number as big as 666, so some have suggested converting this way and then multiplying by the "number of man", which some suppose is 6 - one short of the number of completion. Again, some notable people's names produce 666 in this way.

Printing
Checks, Invoices, and many other documents which need to be recognized and handled by people simply print the number. Data processing clerks or scanning devices convert these numbers back into the numbers needed by the computers.
Magnetic strip
Credit cards and debit cards (and a host of other identifying devices) use these little strips of magnetic tape to store your number and other information.
Transponders
A tiny electronic chip which may be injected into an animal or a human will respond to the stimulus of a certain kind of scanner by transmitting your numerical data.
Bar Code
Laser scanners use the bar codes on products to print your sales receipt. The number on the package is converted to a name, a price, and at the same time it is subtracted from inventory and placed on the store's next re-order form.

It has been noticed by some that the UPC bar codes are generally divided into two parts by three bars, one at the beginning, one at the end, and one in the middle. These marks may be longer than the numbers, but they may look the same as one of the codes for the number six. Thus, some bar codes do have the number 666 built into it. This may or may not have any significance in future understanding of prophecy.

We have been warned that we can not know who Antichrist is until he is revealed, after the Restrainer (The Holy Spirit) is no longer holding back sin (2 Thessalonians 2:1-11). But those who are alive during that time might recognize him partly by this number. It will be wise and proper for those living during that time to "calculate" his number (verse 18).

It should also be noted that, even though it is logical for us to have our own numbers, and that, for security reasons, these numbers might even be tattooed on or implanted in us, the number that will be displayed on the hand or forehead will not be our number, but Antichrist's. Those who are more bold in their devotion to him will not have his number, but his actual name!