91171770065 has 16 divisors (see below), whose sum is σ = 111745260288. Its totient is φ = 71378307456.

The previous prime is 91171770059. The next prime is 91171770073. The reversal of 91171770065 is 56007717119.

It is a cyclic number.

It is not a de Polignac number, because 91171770065 - 2²⁶ = 91104661201 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91171769998 and 91171770025.

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, 4568549 + ... + 4588461.

It is an arithmetic number, because the mean of its divisors is an integer number (6984078768).

Almost surely, 2^91171770065 is an apocalyptic number.

It is an amenable number.

91171770065 is a deficient number, since it is larger than the sum of its proper divisors (20573490223).

91171770065 is a wasteful number, since it uses less digits than its factorization.

91171770065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39448.

The product of its (nonzero) digits is 92610, while the sum is 44.

The spelling of 91171770065 in words is "ninety-one billion, one hundred seventy-one million, seven hundred seventy thousand, sixty-five".