91621263279 has 64 divisors (see below), whose sum is σ = 154356629504. Its totient is φ = 47048190336.

The previous prime is 91621263257. The next prime is 91621263299. The reversal of 91621263279 is 97236212619.

It is not a de Polignac number, because 91621263279 - 2⁸ = 91621263023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91621263299) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3591162 + ... + 3616584.

It is an arithmetic number, because the mean of its divisors is an integer number (2411822336).

Almost surely, 2^91621263279 is an apocalyptic number.

91621263279 is a deficient number, since it is larger than the sum of its proper divisors (62735366225).

91621263279 is a wasteful number, since it uses less digits than its factorization.

91621263279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25796.

The product of its digits is 489888, while the sum is 48.

The spelling of 91621263279 in words is "ninety-one billion, six hundred twenty-one million, two hundred sixty-three thousand, two hundred seventy-nine".