"Demonic" 666 found in massive palindromic prime number

By Michael Pacher - The Yorck Project (2002) 10.000 Meisterwerke der Malerei (DVD-ROM), distributed by DIRECTMEDIA Publishing GmbH. ISBN: 3936122202., Public Domain.

1,000,000,000,000,066,600,000,000,000,001 is a prime number.

It's unusual for at least two reasons. First, it's a palindrome, so it reads the same backwards as forwards (not counting the comm…