It's interesting to note that the number "666" is not evil in and of itself. The Bible says that "6" is the number of man / of incompletion. "7" is the number of completion / perfection. We may be able to know that things revealed in the book of the Revelation are identifiable because they are happening in groups of 6 and, it has been said that the "mark of the beast" may contain sixes - no way to confirm that for sure until the time comes.
"Nummi rari mira sunt, si sumptus ferre potes." - Christophorus filius Scotiae