91549485775 has 24 divisors (see below), whose sum is σ = 129225907584. Its totient is φ = 63686594400.

The previous prime is 91549485761. The next prime is 91549485827. The reversal of 91549485775 is 57758494519.

It is not a de Polignac number, because 91549485775 - 2⁵ = 91549485743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7230789 + ... + 7243438.

It is an arithmetic number, because the mean of its divisors is an integer number (5384412816).

Almost surely, 2^91549485775 is an apocalyptic number.

91549485775 is a deficient number, since it is larger than the sum of its proper divisors (37676421809).

91549485775 is a wasteful number, since it uses less digits than its factorization.

91549485775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14474271 (or 14474266 counting only the distinct ones).

The product of its digits is 63504000, while the sum is 64.

The spelling of 91549485775 in words is "ninety-one billion, five hundred forty-nine million, four hundred eighty-five thousand, seven hundred seventy-five".