91713365661 has 4 divisors (see below), whose sum is σ = 122284487552. Its totient is φ = 61142243772.

The previous prime is 91713365657. The next prime is 91713365663. The reversal of 91713365661 is 16656331719.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16656331719 = 3 ⋅5552110573.

It is not a de Polignac number, because 91713365661 - 2² = 91713365657 is a prime.

It is a super-2 number, since 2×91713365661² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91713365661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91713365663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15285560941 + ... + 15285560946.

It is an arithmetic number, because the mean of its divisors is an integer number (30571121888).

Almost surely, 2^91713365661 is an apocalyptic number.

It is an amenable number.

91713365661 is a deficient number, since it is larger than the sum of its proper divisors (30571121891).

91713365661 is a wasteful number, since it uses less digits than its factorization.

91713365661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30571121890.

The product of its digits is 612360, while the sum is 48.

The spelling of 91713365661 in words is "ninety-one billion, seven hundred thirteen million, three hundred sixty-five thousand, six hundred sixty-one".