668913005979 has 40 divisors (see below), whose sum is σ = 1042795815072. Its totient is φ = 426508156800.

The previous prime is 668913005951. The next prime is 668913005983. The reversal of 668913005979 is 979500319866.

668913005979 is a `hidden beast` number, since 6 + 6 + 8 + 9 + 1 + 30 + 0 + 597 + 9 = 666.

It is not a de Polignac number, because 668913005979 - 2²⁰ = 668911957403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668913005279) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 33771879 + ... + 33791679.

Almost surely, 2^668913005979 is an apocalyptic number.

668913005979 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

668913005979 is a deficient number, since it is larger than the sum of its proper divisors (373882809093).

668913005979 is a wasteful number, since it uses less digits than its factorization.

668913005979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37969 (or 37960 counting only the distinct ones).

The product of its (nonzero) digits is 22044960, while the sum is 63.

The spelling of 668913005979 in words is "six hundred sixty-eight billion, nine hundred thirteen million, five thousand, nine hundred seventy-nine".