91331633663 has 8 divisors (see below), whose sum is σ = 98528689008. Its totient is φ = 84337312384.

The previous prime is 91331633621. The next prime is 91331633677. The reversal of 91331633663 is 36633613319.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91331633663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91331633563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50682581 + ... + 50684382.

It is an arithmetic number, because the mean of its divisors is an integer number (12316086126).

Almost surely, 2^91331633663 is an apocalyptic number.

91331633663 is a deficient number, since it is larger than the sum of its proper divisors (7197055345).

91331633663 is a wasteful number, since it uses less digits than its factorization.

91331633663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101367033.

The product of its digits is 472392, while the sum is 44.

The spelling of 91331633663 in words is "ninety-one billion, three hundred thirty-one million, six hundred thirty-three thousand, six hundred sixty-three".