P. Zimerickus: I like to play a game not to invite the dark lord into my study...., please
Sachys: 616 is the number you're thinking of.
666 is the number to call them (via an 0800 prefix and the correct suffix).
Seriously though, 666 is a modern construct.
616 and 666 are both accepted, it depends on the translation you're using. 666 is also not a modern construct. The myth is that it was made for the Omen films, because the way it looks, but this is not correct - it is quite old.
The number appears in the Book of Revelation, but the variation comes down to differences in manuscripts and translations. The number is a form of gematria (a system where letters have numerical values) for either Nero Caesar (Latin form) or Neron Caesar (Hebrew form). The Latin form gives you 666, while the Hebrew form gives you 616. What you are most probably referring to, is that the oldest known manuscript uses 616. That said, later translated versions, especially those in Latin, typically use 666.
(And as we all know, The Book of Revelation is widely interpreted as a political allegory, where The Beast is thought to be a reference to Emperor Nero.)
