From Good Omens (Neil Gaiman and Terry Pratchett):
They were doing drinks in a restaurant called Top of the Sixes, on the top of 666 Fifth Avenue, New York. This was something that amused Sable ever so slightly. From the restaurant windows you could see the whole of New York; at night, the rest of New York could see the huge red 666s that adorned all sides of the building. Of course, it was just another street number. If you started counting, you'd be bound to to get to it eventually. But you had to smile.