668905167020 has 48 divisors (see below), whose sum is σ = 1411238384640. Its totient is φ = 266317231296.

The previous prime is 668905167017. The next prime is 668905167037. The reversal of 668905167020 is 20761509866.

It is a self number, because there is not a number n which added to its sum of digits gives 668905167020.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42000779 + ... + 42016701.

It is an arithmetic number, because the mean of its divisors is an integer number (29400799680).

Almost surely, 2^668905167020 is an apocalyptic number.

It is an amenable number.

668905167020 is an abundant number, since it is smaller than the sum of its proper divisors (742333217620).

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

668905167020 is a wasteful number, since it uses less digits than its factorization.

668905167020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25574 (or 25572 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 668905167020 in words is "six hundred sixty-eight billion, nine hundred five million, one hundred sixty-seven thousand, twenty".