91864973652 has 12 divisors (see below), whose sum is σ = 214351605216. Its totient is φ = 30621657880.

The previous prime is 91864973639. The next prime is 91864973663. The reversal of 91864973652 is 25637946819.

It is a tau number, because it is divible by the number of its divisors (12).

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, 3827707224 + ... + 3827707247.

It is an arithmetic number, because the mean of its divisors is an integer number (17862633768).

Almost surely, 2^91864973652 is an apocalyptic number.

It is an amenable number.

91864973652 is an abundant number, since it is smaller than the sum of its proper divisors (122486631564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91864973652 is a wasteful number, since it uses less digits than its factorization.

91864973652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7655414478 (or 7655414476 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 60.

The spelling of 91864973652 in words is "ninety-one billion, eight hundred sixty-four million, nine hundred seventy-three thousand, six hundred fifty-two".