91976374772 has 6 divisors (see below), whose sum is σ = 160958655858. Its totient is φ = 45988187384.

The previous prime is 91976374769. The next prime is 91976374783. The reversal of 91976374772 is 27747367919.

It can be written as a sum of positive squares in only one way, i.e., 64275432676 + 27700942096 = 253526^2 + 166436^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11497046843 + ... + 11497046850.

It is an arithmetic number, because the mean of its divisors is an integer number (26826442643).

Almost surely, 2^91976374772 is an apocalyptic number.

It is an amenable number.

91976374772 is a deficient number, since it is larger than the sum of its proper divisors (68982281086).

91976374772 is a wasteful number, since it uses less digits than its factorization.

91976374772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22994093697 (or 22994093695 counting only the distinct ones).

The product of its digits is 28005264, while the sum is 62.

The spelling of 91976374772 in words is "ninety-one billion, nine hundred seventy-six million, three hundred seventy-four thousand, seven hundred seventy-two".