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It is considered a number of the devil due to the fact that 6+6+6=18, and 666 is the number of the beast, as described in chapter 13, verse 18 of the Book of Revelation. There are also 18 letters in the words six-hundred sixty six.
I removed this for numerous reasons, first of all a simple search of "18 is a number of the devil" or "18 is a number of the beast" or "18 is the number of the devil" or "18 is the number of the beast" returns no results at all on Google.com. Also non of the other languages articles mention this, including languages spoken by perhaps more Christian inclined people (Spanish, Italian).
Also in "six-hundred and sixty six" there is 21 letters! No evidence to show anywhere that it is a "demonic" number of even believed to be. - S.Azzopardi (talk) 05:29, 6 February 2008 (UTC)
True, but to be pedantic and fair to the user, he did say "six-hundred sixty six" which does have eighteen letters; without the "and" is how it is frequently said (insisted upon in school) in the USA. That to one side, though, i've never heard of the suggestion that eighteen is an evil number. Cheers, Lindsay 17:07, 14 February 2008 (UTC)