The Brainliest Answer!
* 666 is the sum of the first 36 natural numbers...!
* it is known as the number of the beast !!
* the number 666 is seen as an evil number as it has been incribed many times on    bodies of rock stars ...!!!
* also called number of SATAN !!!!
* but in china it is considered as a lucky number.....

Thanks for reading    :)
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