91656215011 has 4 divisors (see below), whose sum is σ = 92467332072. Its totient is φ = 90845097952.

The previous prime is 91656214931. The next prime is 91656215017. The reversal of 91656215011 is 11051265619.

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 91656215011 - 2¹⁵ = 91656182243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91656215017) 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, 405558361 + ... + 405558586.

It is an arithmetic number, because the mean of its divisors is an integer number (23116833018).

Almost surely, 2^91656215011 is an apocalyptic number.

91656215011 is a deficient number, since it is larger than the sum of its proper divisors (811117061).

91656215011 is a wasteful number, since it uses less digits than its factorization.

91656215011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811117060.

The product of its (nonzero) digits is 16200, while the sum is 37.

The spelling of 91656215011 in words is "ninety-one billion, six hundred fifty-six million, two hundred fifteen thousand, eleven".