91577073933 has 32 divisors (see below), whose sum is σ = 137735838720. Its totient is φ = 60122185200.

The previous prime is 91577073877. The next prime is 91577073947. The reversal of 91577073933 is 33937077519.

It is a happy number.

91577073933 is a `hidden beast` number, since 9 + 1 + 577 + 0 + 7 + 39 + 33 = 666.

It is not a de Polignac number, because 91577073933 - 2¹⁴ = 91577057549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91577073933.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91577073233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9016408 + ... + 9026558.

It is an arithmetic number, because the mean of its divisors is an integer number (4304244960).

Almost surely, 2^91577073933 is an apocalyptic number.

It is an amenable number.

91577073933 is a deficient number, since it is larger than the sum of its proper divisors (46158764787).

91577073933 is a wasteful number, since it uses less digits than its factorization.

91577073933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15214 (or 15208 counting only the distinct ones).

The product of its (nonzero) digits is 3750705, while the sum is 54.

The spelling of 91577073933 in words is "ninety-one billion, five hundred seventy-seven million, seventy-three thousand, nine hundred thirty-three".