91550117757 has 32 divisors (see below), whose sum is σ = 140655923200. Its totient is φ = 51884426880.

The previous prime is 91550117707. The next prime is 91550117767. The reversal of 91550117757 is 75771105519.

It is not a de Polignac number, because 91550117757 - 2⁸ = 91550117501 is a prime.

It is a super-2 number, since 2×91550117757² (a number of 23 digits) contains 22 as substring.

It is the 302573-rd Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91550117707) by changing a digit.

It is a nontrivial repunit in base 302572.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1273032 + ... + 1343022.

It is an arithmetic number, because the mean of its divisors is an integer number (4395497600).

Almost surely, 2^91550117757 is an apocalyptic number.

It is an amenable number.

91550117757 is a deficient number, since it is larger than the sum of its proper divisors (49105805443).

91550117757 is a wasteful number, since it uses less digits than its factorization.

91550117757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70513.

The product of its (nonzero) digits is 385875, while the sum is 48.

The spelling of 91550117757 in words is "ninety-one billion, five hundred fifty million, one hundred seventeen thousand, seven hundred fifty-seven".