There exists a prime number called a "Belphegor's Prime", which is a palindromic prime number with a rather eerie and fascinating structure. It is named after Belphegor, one of the seven princes of Hell in demonology.

The number is:

1000000000000066600000000000001

This prime number has:

- 13 zeros on either side,

- The number 666 (often associated with the "Number of the Beast" in popular culture) in the middle,

- And is a palindrome (it reads the same backward as forward).

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