668722806163256 has 64 divisors (see below), whose sum is σ = 1377543842488800. Its totient is φ = 302453044876800.

The previous prime is 668722806163199. The next prime is 668722806163261. The reversal of 668722806163256 is 652361608227866.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194223350 + ... + 197636421.

Almost surely, 2^{668722806163256} is an apocalyptic number.

It is an amenable number.

668722806163256 is an abundant number, since it is smaller than the sum of its proper divisors (708821036325544).

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

668722806163256 is a wasteful number, since it uses less digits than its factorization.

668722806163256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391860120 (or 391860116 counting only the distinct ones).

The product of its (nonzero) digits is 418037760, while the sum is 68.

The spelling of 668722806163256 in words is "six hundred sixty-eight trillion, seven hundred twenty-two billion, eight hundred six million, one hundred sixty-three thousand, two hundred fifty-six".