668939054364 has 90 divisors (see below), whose sum is σ = 2034247251960. Its totient is φ = 191125439568.

The previous prime is 668939054351. The next prime is 668939054389. The reversal of 668939054364 is 463450939866.

It is a happy number.

668939054364 is a `hidden beast` number, since 6 + 6 + 89 + 3 + 9 + 0 + 543 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 21051744 + ... + 21083495.

It is an arithmetic number, because the mean of its divisors is an integer number (22602747244).

Almost surely, 2^668939054364 is an apocalyptic number.

It is an amenable number.

668939054364 is an abundant number, since it is smaller than the sum of its proper divisors (1365308197596).

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

668939054364 is a wasteful number, since it uses less digits than its factorization.

668939054364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42135269 (or 42135251 counting only the distinct ones).

The product of its (nonzero) digits is 100776960, while the sum is 63.

The spelling of 668939054364 in words is "six hundred sixty-eight billion, nine hundred thirty-nine million, fifty-four thousand, three hundred sixty-four".