91057578033 has 16 divisors (see below), whose sum is σ = 128271718400. Its totient is φ = 57297825360.

The previous prime is 91057578011. The next prime is 91057578067. The reversal of 91057578033 is 33087575019.

It is not a de Polignac number, because 91057578033 - 2¹⁸ = 91057315889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91057578233) 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, 2931973 + ... + 2962866.

It is an arithmetic number, because the mean of its divisors is an integer number (8016982400).

Almost surely, 2^91057578033 is an apocalyptic number.

It is an amenable number.

91057578033 is a deficient number, since it is larger than the sum of its proper divisors (37214140367).

91057578033 is a wasteful number, since it uses less digits than its factorization.

91057578033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5895132.

The product of its (nonzero) digits is 793800, while the sum is 48.

The spelling of 91057578033 in words is "ninety-one billion, fifty-seven million, five hundred seventy-eight thousand, thirty-three".