668860579688 has 24 divisors (see below), whose sum is σ = 1458866826450. Its totient is φ = 286654533984.

The previous prime is 668860579679. The next prime is 668860579697. The reversal of 668860579688 is 886975068866.

It is an interprime number because it is at equal distance from previous prime (668860579679) and next prime (668860579697).

It can be written as a sum of positive squares in only one way, i.e., 549795556324 + 119065023364 = 741482^2 + 345058^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 853138103 + ... + 853138886.

Almost surely, 2^668860579688 is an apocalyptic number.

It is an amenable number.

668860579688 is an abundant number, since it is smaller than the sum of its proper divisors (790006246762).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668860579688 is a wasteful number, since it uses less digits than its factorization.

668860579688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706277009 (or 1706276998 counting only the distinct ones).

The product of its (nonzero) digits is 1672151040, while the sum is 77.

The spelling of 668860579688 in words is "six hundred sixty-eight billion, eight hundred sixty million, five hundred seventy-nine thousand, six hundred eighty-eight".