91895864520 has 64 divisors (see below), whose sum is σ = 281553304320. Its totient is φ = 23984167424.

The previous prime is 91895864497. The next prime is 91895864549. The reversal of 91895864520 is 2546859819.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8141157 + ... + 8152436.

It is an arithmetic number, because the mean of its divisors is an integer number (4399270380).

Almost surely, 2^91895864520 is an apocalyptic number.

It is an amenable number.

91895864520 is an abundant number, since it is smaller than the sum of its proper divisors (189657439800).

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

91895864520 is a wasteful number, since it uses less digits than its factorization.

91895864520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16293654 (or 16293650 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 57.

The spelling of 91895864520 in words is "ninety-one billion, eight hundred ninety-five million, eight hundred sixty-four thousand, five hundred twenty".