391669717988 has 12 divisors (see below), whose sum is σ = 686589680112. Its totient is φ = 195501237960.

The previous prime is 391669717973. The next prime is 391669717993. The reversal of 391669717988 is 889717966193.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83402618 + ... + 83407313.

It is an arithmetic number, because the mean of its divisors is an integer number (57215806676).

Almost surely, 2^391669717988 is an apocalyptic number.

It is an amenable number.

391669717988 is a deficient number, since it is larger than the sum of its proper divisors (294919962124).

391669717988 is a wasteful number, since it uses less digits than its factorization.

391669717988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166810522 (or 166810520 counting only the distinct ones).

The product of its digits is 246903552, while the sum is 74.

The spelling of 391669717988 in words is "three hundred ninety-one billion, six hundred sixty-nine million, seven hundred seventeen thousand, nine hundred eighty-eight".