A number having 666 digits (where 666 is the beast
number) is called an apocalypse number.
The Fibonacci number is the smallest Fibonacci apocalypse number (Livio
2002, p. 108).
Apocalypse primes are given by for , 1837, 6409, 7329, 8569, 8967, 9663, ... (OEIS A115983).
The smallest apocalypse prime containing the digits 666 is (Rupinski).