1000000000000066600000000000001, or the Belphegor’s Prime is considered to be the most evil number. It has 666 in the middle, with 13 zeros on either side. The other thing that’s evil about Belphegor’s Prime is that there’s actually 31 digits which of course is 13 if you read it backwards. Also, one of the most interesting things about Belphegor’s Prime is that it follows this pattern : B(n) = 1(n zeroes)666(n zeroes)1

Via – Numberphile


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