Actually common misconception ;P
“666,” the oft-quoted number of Satan, or perhaps his area code, is not the Mark of the Beast as most people believe. Though it’s less memorable and certainly not as cool-looking, the real number is 616, according to an ancient fragment of, you guessed it, the Bible. The fragment predates every other copy of Revelation, where John, the mysterious author, mentions the Mark of the Beast as the tattoo you’ll have to get if you want to conduct business in the new apocalyptic world.
http://knowledgenuts.com/2013/08/12/the-devils-number-is-not-666/
oh and -17