77975657977 has 16 divisors (see below), whose sum is σ = 93117652992. Its totient is φ = 63842320080.

The previous prime is 77975657951. The next prime is 77975657989.

77975657977 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 77975657977 - 2¹⁵ = 77975625209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77975655977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 216049 + ... + 450142.

It is an arithmetic number, because the mean of its divisors is an integer number (5819853312).

Almost surely, 2^77975657977 is an apocalyptic number.

It is an amenable number.

77975657977 is a deficient number, since it is larger than the sum of its proper divisors (15141995015).

77975657977 is a wasteful number, since it uses less digits than its factorization.

77975657977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666948.

The product of its digits is 1429435350, while the sum is 76.

The spelling of 77975657977 in words is "seventy-seven billion, nine hundred seventy-five million, six hundred fifty-seven thousand, nine hundred seventy-seven".