What are some interesting mathematical facts about the number 666?

[kraphysics]

2(012) + 20(12) + 201(2)= 666!

I don't mean to start a discussion on 2012 or on religious topics, I just thought that was cool.

 

[micromass]

Other cool thingies:

- 666 is the number of the first seven primes
- $$\phi(666)=6.6.6$$, where phi is the Euler totient function
- $$\sum_{i=1}^{6.6}{i}=666$$
- $$\phi=-2\sin(666^\circ)=-2\cos(6.6.6^\circ)$$ where phi is the golden ratio
- The first $$12^2$$ numbers of the fractional expansion of pi sum up to 666.

Also note that the original number of the beast was reportedly 616, and not 666...