491902564120 has 64 divisors (see below), whose sum is σ = 1207470551040. Its totient is φ = 178862793600.

The previous prime is 491902564081. The next prime is 491902564163. The reversal of 491902564120 is 21465209194.

It is a super-2 number, since 2×491902564120² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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, 12313699 + ... + 12353581.

It is an arithmetic number, because the mean of its divisors is an integer number (18866727360).

Almost surely, 2^491902564120 is an apocalyptic number.

491902564120 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491902564120 is an abundant number, since it is smaller than the sum of its proper divisors (715567986920).

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

491902564120 is a wasteful number, since it uses less digits than its factorization.

491902564120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67936 (or 67932 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 491902564120 in words is "four hundred ninety-one billion, nine hundred two million, five hundred sixty-four thousand, one hundred twenty".