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8.
666
666 is an abundant number. It is the sum of the squares of the first seven prime numbers.

Since 36 is both square and triangular, 666 is the sixth number of the form n2(n2 + 1) / 2 (triangular squares) and the eighth number of the form n(n + 1)(n2 + n + 2) / 8 (doubly triangular numbers.)

There is no number whose value of Euler's totient function ö is 666, making it a nontotient.

The harmonic mean of the digits of 666 is an integer: 3/(1/6 + 1/6 + 1/6) = 6. 666 is the 54th number with this property.

In base 10, 666 is a palindromic number, a repdigit and a Smith number. A prime reciprocal magic square based on 1/149 in base 10 has a magic total of 666.

The Roman numeral representation of the number 666 (DCLXVI) uses once each the Roman numeral symbols with values under 1,000, and they occur in exact reverse order of their respective values (D = 500, C = 100, L = 50, X = 10, V = 5, I = 1).

I had no idea that the number 666 had any relavance to a legitimate mathmatical formula!
by Cortan May 23, 2006
 
9.
666
Six hundred and sixty six. The number of anti-christ, the beast- what was actually implied is open to interpretation. The number is assocciated with satanism because it is the number to mark the downfall of christianity. Pussy-hole goths use this number to act hard. They are unaware everyone knows they don't have physchic powers and shit, so just kick seven shades of green shit outta them anyway.
Woe to you o earth and see, for the devil sends the beast with wrath, because he knows the time is short.

Let he who hath understanding reckon the number of the beast for it is a human number.

It's number is six hundred and sixty six.


-Revelations chapter 13, Verse 18. As said in "The number of the beast" by Iron Maiden
by Gumba Gumba March 06, 2004
 
10.
666
most. uverused. numbers. EVAR. Mostly found in a cockfucks IM name.
exsamples:
cocksucker666
666 4 LIFe
six6six
Jebusloves666
Gayfag666
goffik666
killmenow666
lovinit666
hornydude666
sexyou666
by dot dot dot July 13, 2003
 
11.
666
dumbest nickname in pc games
-BROT-666
Viper666
6is6my6number
by sab0t October 30, 2004
 
12.
666
1-Mark of the Beast
2-A number which people put in their screen name so they can look cool, but they aren't.
1-Dude, 666 is a bad number!
2-Man,I didn't fight that cooldude666 guy because I could tell by his name he was a loser.
by James the azn February 12, 2006
 
13.
666
The number of the beast
by Chevy July 05, 2003
 
14.
666
a sex position where all three participants are standing on their heads and two are taking it doggy-style
I just got a 666 with the Olsen twins!
by Sir_Cock33 February 17, 2010