91414658765 has 4 divisors (see below), whose sum is σ = 109697590524. Its totient is φ = 73131727008.

The previous prime is 91414658749. The next prime is 91414658779. The reversal of 91414658765 is 56785641419.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15695579524 + 75719079241 = 125282^2 + 275171^2 .

It is a cyclic number.

It is not a de Polignac number, because 91414658765 - 2⁴ = 91414658749 is a prime.

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 91414658765.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9141465872 + ... + 9141465881.

It is an arithmetic number, because the mean of its divisors is an integer number (27424397631).

Almost surely, 2^91414658765 is an apocalyptic number.

It is an amenable number.

91414658765 is a deficient number, since it is larger than the sum of its proper divisors (18282931759).

91414658765 is a wasteful number, since it uses less digits than its factorization.

91414658765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18282931758.

The product of its digits is 7257600, while the sum is 56.

The spelling of 91414658765 in words is "ninety-one billion, four hundred fourteen million, six hundred fifty-eight thousand, seven hundred sixty-five".