91506500501601 has 32 divisors (see below), whose sum is σ = 126620313458688. Its totient is φ = 58742702504640.

The previous prime is 91506500501579. The next prime is 91506500501623. The reversal of 91506500501601 is 10610500560519.

It is an interprime number because it is at equal distance from previous prime (91506500501579) and next prime (91506500501623).

It is not a de Polignac number, because 91506500501601 - 2⁹ = 91506500501089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91506500501601.

It is not an unprimeable number, because it can be changed into a prime (91506500001601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1689691 + ... + 13633343.

It is an arithmetic number, because the mean of its divisors is an integer number (3956884795584).

Almost surely, 2^{91506500501601} is an apocalyptic number.

It is an amenable number.

91506500501601 is a deficient number, since it is larger than the sum of its proper divisors (35113812957087).

91506500501601 is a wasteful number, since it uses less digits than its factorization.

91506500501601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11944581.

The product of its (nonzero) digits is 40500, while the sum is 39.

The spelling of 91506500501601 in words is "ninety-one trillion, five hundred six billion, five hundred million, five hundred one thousand, six hundred one".