977846661 has 40 divisors (see below), whose sum is σ = 1623672864. Its totient is φ = 581424480.

The previous prime is 977846657. The next prime is 977846663. The reversal of 977846661 is 166648779.

It is a happy number.

It is not a de Polignac number, because 977846661 - 2² = 977846657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 977846598 and 977846607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (977846663) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 36870 + ... + 57576.

Almost surely, 2^977846661 is an apocalyptic number.

It is an amenable number.

977846661 is a deficient number, since it is larger than the sum of its proper divisors (645826203).

977846661 is a wasteful number, since it uses less digits than its factorization.

977846661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20783 (or 20774 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 977846661 is about 31270.5398258489. The cubic root of 977846661 is about 992.5603424197.

The spelling of 977846661 in words is "nine hundred seventy-seven million, eight hundred forty-six thousand, six hundred sixty-one".