91569180816 has 135 divisors (see below), whose sum is σ = 259528905363. Its totient is φ = 30139358400.

The previous prime is 91569180799. The next prime is 91569180827. The reversal of 91569180816 is 61808196519.

The square root of 91569180816 is 302604.

It is a perfect power (a square), and thus also a powerful number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 548318365 + ... + 548318531.

Almost surely, 2^91569180816 is an apocalyptic number.

91569180816 is the 302604-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91569180816

91569180816 is an abundant number, since it is smaller than the sum of its proper divisors (167959724547).

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

91569180816 is a wasteful number, since it uses less digits than its factorization.

91569180816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 54.

The spelling of 91569180816 in words is "ninety-one billion, five hundred sixty-nine million, one hundred eighty thousand, eight hundred sixteen".