668556915583 has 2 divisors, whose sum is σ = 668556915584. Its totient is φ = 668556915582.

The previous prime is 668556915529. The next prime is 668556915601. The reversal of 668556915583 is 385519655866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668556915583 - 2²⁵ = 668523361151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668556945583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334278457791 + 334278457792.

It is an arithmetic number, because the mean of its divisors is an integer number (334278457792).

Almost surely, 2^668556915583 is an apocalyptic number.

668556915583 is a deficient number, since it is larger than the sum of its proper divisors (1).

668556915583 is an equidigital number, since it uses as much as digits as its factorization.

668556915583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280000, while the sum is 67.

The spelling of 668556915583 in words is "six hundred sixty-eight billion, five hundred fifty-six million, nine hundred fifteen thousand, five hundred eighty-three".