Belphegor's Prime
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Interesting Number
Belphegor's prime is the palindromic prime:
- $1000000000000066600000000000001$
It has:
- $666$: the Number of the Beast in its center
- Unlucky number $13$ zeroes either side of the $666$
- $31$ digits, which is not only itself prime, but backwards is $13$ which is also prime.
Linguistic Note
The name Belphegor's Prime refers to Belphegor, one of the Seven Princes of Hell, whose particular specialty was helping people make ingenious inventions and discoveries.