668857525917 has 32 divisors (see below), whose sum is σ = 1026995604480. Its totient is φ = 379293962880.

The previous prime is 668857525879. The next prime is 668857525937. The reversal of 668857525917 is 719525758866.

It is not a de Polignac number, because 668857525917 - 2¹⁹ = 668857001629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668857525937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1664473 + ... + 2026865.

It is an arithmetic number, because the mean of its divisors is an integer number (32093612640).

Almost surely, 2^668857525917 is an apocalyptic number.

It is an amenable number.

668857525917 is a deficient number, since it is larger than the sum of its proper divisors (358138078563).

668857525917 is a wasteful number, since it uses less digits than its factorization.

668857525917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363073.

The product of its digits is 254016000, while the sum is 69.

The spelling of 668857525917 in words is "six hundred sixty-eight billion, eight hundred fifty-seven million, five hundred twenty-five thousand, nine hundred seventeen".