91557184560 has 80 divisors (see below), whose sum is σ = 284121505536. Its totient is φ = 24389938944.

The previous prime is 91557184531. The next prime is 91557184567. The reversal of 91557184560 is 6548175519.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (91557184567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34827 + ... + 429333.

Almost surely, 2^91557184560 is an apocalyptic number.

It is an amenable number.

91557184560 is an abundant number, since it is smaller than the sum of its proper divisors (192564320976).

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

91557184560 is a wasteful number, since it uses less digits than its factorization.

91557184560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395490 (or 395484 counting only the distinct ones).

The product of its (nonzero) digits is 1512000, while the sum is 51.

The spelling of 91557184560 in words is "ninety-one billion, five hundred fifty-seven million, one hundred eighty-four thousand, five hundred sixty".