1000000000000066600000000000001

is a palindromic prime number,

with 666 hiding among the zeros.

Please also note the ominous presence of 13 zeros.

Please don't stare at the number too long.

Look away for a few seconds, and take a deep breath.



The symbol of Belphegor's Prime resembles Pi,

only upside down.

It is derived from a bird glyph

first seen embedded in the Voynich Manuscript.