91959672815 has 4 divisors (see below), whose sum is σ = 110351607384. Its totient is φ = 73567738248.

The previous prime is 91959672799. The next prime is 91959672821. The reversal of 91959672815 is 51827695919.

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

It is a cyclic number.

It is not a de Polignac number, because 91959672815 - 2⁴ = 91959672799 is a prime.

It is a Duffinian number.

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, 9195967277 + ... + 9195967286.

It is an arithmetic number, because the mean of its divisors is an integer number (27587901846).

Almost surely, 2^91959672815 is an apocalyptic number.

91959672815 is a deficient number, since it is larger than the sum of its proper divisors (18391934569).

91959672815 is a wasteful number, since it uses less digits than its factorization.

91959672815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18391934568.

The product of its digits is 12247200, while the sum is 62.

The spelling of 91959672815 in words is "ninety-one billion, nine hundred fifty-nine million, six hundred seventy-two thousand, eight hundred fifteen".