This calls for wisdom. If anyone has insight, let him calculate the number of the beast, for it is man's number. His number is 666.
Revelations 13:18
It says 666 is man's number, not
a man's number. So yup, 666 is the number of man and not necessarily the number of the Antichrist.
On a side note, 666 is also an important permission setting for UNIX users.