91327864216 has 32 divisors (see below), whose sum is σ = 177556377600. Its totient is φ = 43992709920.

The previous prime is 91327864189. The next prime is 91327864223. The reversal of 91327864216 is 61246872319.

It is a happy number.

It is a super-2 number, since 2×91327864216² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 91327864216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 770386 + ... + 880993.

It is an arithmetic number, because the mean of its divisors is an integer number (5548636800).

Almost surely, 2^91327864216 is an apocalyptic number.

It is an amenable number.

91327864216 is a deficient number, since it is larger than the sum of its proper divisors (86228513384).

91327864216 is a wasteful number, since it uses less digits than its factorization.

91327864216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651639 (or 1651635 counting only the distinct ones).

The product of its digits is 870912, while the sum is 49.

The spelling of 91327864216 in words is "ninety-one billion, three hundred twenty-seven million, eight hundred sixty-four thousand, two hundred sixteen".