666

The Number of the Beast goes back to Revelations :

[16]Also it causes all, both small and great, both rich and poor, both free and slave, to be marked on the right hand or the forehead, [17] so that no one can buy or sell who does not have the mark, that is, the name of the beast or the number of its name. [18] This calls for wisdom: let anyone with understanding calculate the number of the beast, for it is the number of a person. Its number is six hundred sixty-six.

and has been brought to the fore by such pop-culture creations as Richard Donner's screen adaptation of David Seltzer's The Omen, Monkey Gone to Heaven from The Pixies and, in the Metal World, Iron Maiden's Number of the Beast.

Now there is one aspect of this myth to which I can't find a link, and that's the association with this number that arose at about the same time as Salmon Hater's 6.66 that featured in the Hottest 100 for 2002. That association includes: 

The Neighbour of the Beast - 

- 664, 668 (next door to the beast); 

- 665, 667 (across the road from The Beast);

The Beast at Retail - 

- $665.98 at KMart

- $663.94 at ALDI, etc.......and so on. 

Hence Unveil 616 are closer to town than The Beast, especially if the road on which The Beast lives starts its numbering from the centre of town.