668657306715 has 32 divisors (see below), whose sum is σ = 1074059627520. Its totient is φ = 355215417984.

The previous prime is 668657306683. The next prime is 668657306731. The reversal of 668657306715 is 517603756866.

It is not a de Polignac number, because 668657306715 - 2⁵ = 668657306683 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13766202 + ... + 13814688.

It is an arithmetic number, because the mean of its divisors is an integer number (33564363360).

Almost surely, 2^668657306715 is an apocalyptic number.

668657306715 is a deficient number, since it is larger than the sum of its proper divisors (405402320805).

668657306715 is a wasteful number, since it uses less digits than its factorization.

668657306715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52091.

The product of its (nonzero) digits is 38102400, while the sum is 60.

The spelling of 668657306715 in words is "six hundred sixty-eight billion, six hundred fifty-seven million, three hundred six thousand, seven hundred fifteen".