990392218965 has 32 divisors (see below), whose sum is σ = 1760918227200. Its totient is φ = 528142898880.

The previous prime is 990392218951. The next prime is 990392218987. The reversal of 990392218965 is 569812293099.

990392218965 is a `hidden beast` number, since 9 + 9 + 0 + 392 + 2 + 189 + 65 = 666.

It is not a de Polignac number, because 990392218965 - 2⁶ = 990392218901 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 628975 + ... + 1541555.

It is an arithmetic number, because the mean of its divisors is an integer number (55028694600).

Almost surely, 2^990392218965 is an apocalyptic number.

It is an amenable number.

990392218965 is a deficient number, since it is larger than the sum of its proper divisors (770526008235).

990392218965 is a wasteful number, since it uses less digits than its factorization.

990392218965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920634 (or 920628 counting only the distinct ones).

The product of its (nonzero) digits is 18895680, while the sum is 63.

The spelling of 990392218965 in words is "nine hundred ninety billion, three hundred ninety-two million, two hundred eighteen thousand, nine hundred sixty-five".