Christos is 666 and Anti-Christ, or "Anti-Christos" is 666 because he will claim that he is THE CHRIST.
(Revelation 13:18) "Here is wisdom. Let him that hath understanding* count the number of the beast: for it is the number of A MAN; and HIS number is Six hundred threescore and six."
*The Key is Understanding that the number of man is 6 ( and the letter A=6, and B=12, C=18, etc. ) so, Christos = 666.
There are 600 names for God and 66 books in the Bible, which = 666. There were 666 talents of gold given to King Solomon (1st Kings 10:14)
The Anti-Christ, (anti-Christos), will be the MAN sitting in the temple of Jerusalem claiming to be the Christ. Christos = 666 and that's why 666 is the number of the beast. The beast IS the anti-Christ and HE will show false signs and miracles to deceive you.
REV.14:9 "If any man worship the beast (the anti-Christ), and his image and receive his mark in his forehead, or in his hand, the same shall drink of the wine of the wrath of God".
REV. 9:4 "[HARM] ONLY THOSE OF MANKIND WHO HAVE NOT THE SEAL OF GOD UPON THEIR FOREHEADS".
...Also read, Rev. 13:18 & 14:19, 2nd Thess 2:3, Matt 24:15, Daniel 11:36-39 & 12:7
(Daniel 8:16) "GABRIEL, MAKE THIS MAN UNDERSTAND"
(Daniel 8:19) "BEHOLD, I WILL MAKE THEE KNOW WHAT SHALL BE IN THE LAST END OF THE INDIGNATION: FOR AT THE TIME APPOINTED THE END SHALL BE".
(Revelation 9:15) "AND THE 4 ANGELS WERE LOOSED, WHICH WERE PREPARED FOR AN HOUR AND A DAY AND A MONTH AND A YEAR, FOR TO SLAY A THIRD PART OF MEN".
(Revelation 10:7) "IN THE DAYS OF THE VOICE OF THE SEVENTH ANGEL, WHEN HE SHALL BEGIN TO SOUND, THE MYSTERY OF GOD SHOULD BE FINISHED, AS HE HATH DECLARED TO HIS SERVANTS THE PROPHETS".
... GET A KING JAMES BIBLE, IT IS THE LAST AUTHORIZED VERSION...READ IT.
Revelation 1:3 "Blessed is he that readeth, and they that hear the words of this prophecy"