91220210260715 has 16 divisors (see below), whose sum is σ = 115127345108736. Its totient is φ = 69289605840000.

The previous prime is 91220210260709. The next prime is 91220210260783. The reversal of 91220210260715 is 51706201202219.

It is not a de Polignac number, because 91220210260715 - 2¹⁰ = 91220210259691 is a prime.

It is a super-2 number, since 2×91220210260715² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5552043536 + ... + 5552059965.

It is an arithmetic number, because the mean of its divisors is an integer number (7195459069296).

Almost surely, 2^{91220210260715} is an apocalyptic number.

91220210260715 is a deficient number, since it is larger than the sum of its proper divisors (23907134848021).

91220210260715 is a wasteful number, since it uses less digits than its factorization.

91220210260715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11104103590.

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 91220210260715 in words is "ninety-one trillion, two hundred twenty billion, two hundred ten million, two hundred sixty thousand, seven hundred fifteen".