91777077918 has 64 divisors (see below), whose sum is σ = 216105331200. Its totient is φ = 28790251200.

The previous prime is 91777077913. The next prime is 91777078037. The reversal of 91777077918 is 81977077719.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91777077913) 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, 141271 + ... + 451122.

It is an arithmetic number, because the mean of its divisors is an integer number (3376645800).

Almost surely, 2^91777077918 is an apocalyptic number.

91777077918 is an abundant number, since it is smaller than the sum of its proper divisors (124328253282).

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

91777077918 is a wasteful number, since it uses less digits than its factorization.

91777077918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592574 (or 592568 counting only the distinct ones).

The product of its (nonzero) digits is 10890936, while the sum is 63.

The spelling of 91777077918 in words is "ninety-one billion, seven hundred seventy-seven million, seventy-seven thousand, nine hundred eighteen".