491770275480988 has 72 divisors (see below), whose sum is σ = 1002245565985664. Its totient is φ = 206823636381600.

The previous prime is 491770275480959. The next prime is 491770275481007. The reversal of 491770275480988 is 889084572077194.

It is a happy number.

It is a super-2 number, since 2×491770275480988² (a number of 30 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 23 ways as a sum of consecutive naturals, for example, 51236143 + ... + 60072313.

Almost surely, 2^{491770275480988} is an apocalyptic number.

It is an amenable number.

491770275480988 is an abundant number, since it is smaller than the sum of its proper divisors (510475290504676).

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

491770275480988 is a wasteful number, since it uses less digits than its factorization.

491770275480988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8836871 (or 8836810 counting only the distinct ones).

The product of its (nonzero) digits is 2275983360, while the sum is 79.

The spelling of 491770275480988 in words is "four hundred ninety-one trillion, seven hundred seventy billion, two hundred seventy-five million, four hundred eighty thousand, nine hundred eighty-eight".