668568164680 has 32 divisors (see below), whose sum is σ = 1619992092600. Its totient is φ = 246855937536.

The previous prime is 668568164651. The next prime is 668568164729. The reversal of 668568164680 is 86461865866.

It can be written as a sum of positive squares in 4 ways, for example, as 617239637316 + 51328527364 = 785646^2 + 226558^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 642853485 + ... + 642854524.

Almost surely, 2^668568164680 is an apocalyptic number.

It is an amenable number.

668568164680 is an abundant number, since it is smaller than the sum of its proper divisors (951423927920).

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

668568164680 is a wasteful number, since it uses less digits than its factorization.

668568164680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285708033 (or 1285708029 counting only the distinct ones).

The product of its (nonzero) digits is 79626240, while the sum is 64.

The spelling of 668568164680 in words is "six hundred sixty-eight billion, five hundred sixty-eight million, one hundred sixty-four thousand, six hundred eighty".