If your 555 , i'm 666

I think there's a band from Australia called Destroyer 666, although I'm not particularly familiar with their music.
Iron Maiden - The Number Of The Beast (song "666 The Number Of The Beast Hell and fire was spawned to be released")

Entombed - DCLXVI To Ride, Shoot Straight And Speak The Truth (album)

Mercyful Fate - Satan´s Fall (song "Something you can´t erase... 666")

Mercyful Fate - Dead Again (song "The Number 6-6-6")

The Crown - 1999 Revolution 666 (song)

In Flames - Episode 666 (song)