91575736722 has 18 divisors (see below), whose sum is σ = 198416878023. Its totient is φ = 30524817612.

The previous prime is 91575736699. The next prime is 91575736751. The reversal of 91575736722 is 22763757519.

91575736722 is a `hidden beast` number, since 9 + 1 + 5 + 7 + 573 + 67 + 2 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 45787868361 + 45787868361 = 213981^2 + 213981^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=213981.

It is a super-2 number, since 2×91575736722² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1248223 + ... + 1319549.

Almost surely, 2^91575736722 is an apocalyptic number.

91575736722 is an abundant number, since it is smaller than the sum of its proper divisors (106841141301).

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

91575736722 is an frugal number, since it uses more digits than its factorization.

91575736722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142662 (or 71332 counting only the distinct ones).

The product of its digits is 5556600, while the sum is 54.

The spelling of 91575736722 in words is "ninety-one billion, five hundred seventy-five million, seven hundred thirty-six thousand, seven hundred twenty-two".