649157992920 has 96 divisors (see below), whose sum is σ = 2110032709200. Its totient is φ = 173086707456.

The previous prime is 649157992891. The next prime is 649157992943. The reversal of 649157992920 is 29299751946.

649157992920 is a `hidden beast` number, since 6 + 491 + 57 + 9 + 9 + 2 + 92 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2813286 + ... + 3035274.

Almost surely, 2^649157992920 is an apocalyptic number.

649157992920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

649157992920 is an abundant number, since it is smaller than the sum of its proper divisors (1460874716280).

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

649157992920 is a wasteful number, since it uses less digits than its factorization.

649157992920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230129 (or 230122 counting only the distinct ones).

The product of its (nonzero) digits is 22044960, while the sum is 63.

The spelling of 649157992920 in words is "six hundred forty-nine billion, one hundred fifty-seven million, nine hundred ninety-two thousand, nine hundred twenty".