77785633164 has 24 divisors (see below), whose sum is σ = 181506967600. Its totient is φ = 25927521984.

The previous prime is 77785633153. The next prime is 77785633169. The reversal of 77785633164 is 46133658777.

It is not an unprimeable number, because it can be changed into a prime (77785633169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229062 + ... + 456114.

Almost surely, 2^77785633164 is an apocalyptic number.

It is an amenable number.

77785633164 is an abundant number, since it is smaller than the sum of its proper divisors (103721334436).

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

77785633164 is a wasteful number, since it uses less digits than its factorization.

77785633164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255609 (or 255607 counting only the distinct ones).

The product of its digits is 17781120, while the sum is 57.

The spelling of 77785633164 in words is "seventy-seven billion, seven hundred eighty-five million, six hundred thirty-three thousand, one hundred sixty-four".