665668902192 has 160 divisors (see below), whose sum is σ = 2011606248960. Its totient is φ = 185713274880.

The previous prime is 665668902169. The next prime is 665668902247. The reversal of 665668902192 is 291209866566.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93633934 + ... + 93641042.

It is an arithmetic number, because the mean of its divisors is an integer number (12572539056).

Almost surely, 2^665668902192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665668902192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1005803124480).

665668902192 is an abundant number, since it is smaller than the sum of its proper divisors (1345937346768).

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

665668902192 is a wasteful number, since it uses less digits than its factorization.

665668902192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13651 (or 13645 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 60.

The spelling of 665668902192 in words is "six hundred sixty-five billion, six hundred sixty-eight million, nine hundred two thousand, one hundred ninety-two".