977687865961 has 9 divisors (see below), whose sum is σ = 994599057981. Its totient is φ = 961059535884.

The previous prime is 977687865907. The next prime is 977687865977. The reversal of 977687865961 is 169568786779.

The square root of 977687865961 is 988781.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 977687865961 - 2²³ = 977679477353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (977687865761) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 58329700 + ... + 58346458.

Almost surely, 2^977687865961 is an apocalyptic number.

977687865961 is the 988781-st square number.

977687865961 is the 494391-st centered octagonal number.

It is an amenable number.

977687865961 is a deficient number, since it is larger than the sum of its proper divisors (16911192020).

977687865961 is an frugal number, since it uses more digits than its factorization.

977687865961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33636 (or 16818 counting only the distinct ones).

The product of its digits is 1920360960, while the sum is 79.

The spelling of 977687865961 in words is "nine hundred seventy-seven billion, six hundred eighty-seven million, eight hundred sixty-five thousand, nine hundred sixty-one".