Why is the devils number 666?
6 is the number of man, 7 is the number of completion or perfection, along with 10 and 12 and 1000. But the Beast’s number, when added up, equals 666, and that was Neron Ceasar. Rev. 13:18 – “Let him who has understanding calculate the number of the beast, for the number is that of a man: and his number is 666.” (NASV) The Hebrews had no numerals, and so, used letters to signify numbers, just as the Romans did. Neron Caesar (the Greek rendering, documented by archaeological finds), when transliterated into Hebrew (NRWN QSR) had a number of 666.