The sum of all the numbers on a roulette wheel is 666
1980 Pennsylvania Lottery scandal where the 6 and 4's were weighted so on of the possible drwan numbers would be 666
Fear of 666 is Hexakosioihexekontahexaphobia (I have no idea how to say that one)
Of course it is the number of the beast [url]http://en.wikipedia.org/wiki/Number_of_the_Beast[/url]