I believe that scripture is absolutely clear that the number is 666. There has been, to my knowledge, no credible bible scholar that has disputed this.
Rev 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. (KJV)
Rev 13:18 Here is wisdom. He that hath understanding, let him count the number of the beast; for it is the number of a man: and his number is Six hundred and sixty and six.(ASV)
This is nothing more than the enemy of our soul trying to cause us to question Scripture.
Blessings Greg
P.S. Perhaps the next new translation released will make the change. :-o