91637725516 has 24 divisors (see below), whose sum is σ = 164293004736. Its totient is φ = 44697079680.

The previous prime is 91637725489. The next prime is 91637725519. The reversal of 91637725516 is 61552773619.

It is not an unprimeable number, because it can be changed into a prime (91637725519) 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, 2349970 + ... + 2388646.

It is an arithmetic number, because the mean of its divisors is an integer number (6845541864).

Almost surely, 2^91637725516 is an apocalyptic number.

It is an amenable number.

91637725516 is a deficient number, since it is larger than the sum of its proper divisors (72655279220).

91637725516 is a wasteful number, since it uses less digits than its factorization.

91637725516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53169 (or 53167 counting only the distinct ones).

The product of its digits is 2381400, while the sum is 52.

The spelling of 91637725516 in words is "ninety-one billion, six hundred thirty-seven million, seven hundred twenty-five thousand, five hundred sixteen".