91557453920 has 24 divisors (see below), whose sum is σ = 216304485264. Its totient is φ = 36622981504.

The previous prime is 91557453913. The next prime is 91557453931. The reversal of 91557453920 is 2935475519.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 286116884 + ... + 286117203.

It is an arithmetic number, because the mean of its divisors is an integer number (9012686886).

Almost surely, 2^91557453920 is an apocalyptic number.

It is an amenable number.

91557453920 is an abundant number, since it is smaller than the sum of its proper divisors (124747031344).

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

91557453920 is a wasteful number, since it uses less digits than its factorization.

91557453920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572234102 (or 572234094 counting only the distinct ones).

The product of its (nonzero) digits is 1701000, while the sum is 50.

The spelling of 91557453920 in words is "ninety-one billion, five hundred fifty-seven million, four hundred fifty-three thousand, nine hundred twenty".