91077177867 has 32 divisors (see below), whose sum is σ = 138585287232. Its totient is φ = 52706770944.

The previous prime is 91077177857. The next prime is 91077177871. The reversal of 91077177867 is 76877177019.

It is not a de Polignac number, because 91077177867 - 2¹⁵ = 91077145099 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91077177867.

It is not an unprimeable number, because it can be changed into a prime (91077177857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 750433 + ... + 863309.

It is an arithmetic number, because the mean of its divisors is an integer number (4330790226).

Almost surely, 2^91077177867 is an apocalyptic number.

91077177867 is a deficient number, since it is larger than the sum of its proper divisors (47508109365).

91077177867 is a wasteful number, since it uses less digits than its factorization.

91077177867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114127.

The product of its (nonzero) digits is 7260624, while the sum is 60.

The spelling of 91077177867 in words is "ninety-one billion, seventy-seven million, one hundred seventy-seven thousand, eight hundred sixty-seven".