Because of the mark of the beast being three sixes?
That's because the number of man is 6 because man was created on the sixth day. The three sixes are man trying to be God. That is where the evil is. The number 6 on it's on is just a number. I used to let my OCD torment me over this but, I'm done with it. Now that I know how it works it doesn't frighten me any more.