491477980188 has 96 divisors (see below), whose sum is σ = 1239013216000. Its totient is φ = 150732887040.

The previous prime is 491477980181. The next prime is 491477980199. The reversal of 491477980188 is 881089774194.

It is a super-2 number, since 2×491477980188² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491477980181) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70601028 + ... + 70607988.

Almost surely, 2^491477980188 is an apocalyptic number.

It is an amenable number.

491477980188 is an abundant number, since it is smaller than the sum of its proper divisors (747535235812).

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

491477980188 is a wasteful number, since it uses less digits than its factorization.

491477980188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8387 (or 8385 counting only the distinct ones).

The product of its (nonzero) digits is 32514048, while the sum is 66.

The spelling of 491477980188 in words is "four hundred ninety-one billion, four hundred seventy-seven million, nine hundred eighty thousand, one hundred eighty-eight".