91604733867 has 16 divisors (see below), whose sum is σ = 135720724000. Its totient is φ = 61065319392.

The previous prime is 91604733851. The next prime is 91604733943. The reversal of 91604733867 is 76833740619.

91604733867 is a `hidden beast` number, since 9 + 160 + 473 + 3 + 8 + 6 + 7 = 666.

It is not a de Polignac number, because 91604733867 - 2⁴ = 91604733851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91604733817) 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, 270609 + ... + 506397.

It is an arithmetic number, because the mean of its divisors is an integer number (8482545250).

Almost surely, 2^91604733867 is an apocalyptic number.

91604733867 is a deficient number, since it is larger than the sum of its proper divisors (44115990133).

91604733867 is a wasteful number, since it uses less digits than its factorization.

91604733867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250187 (or 250181 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 54.

The spelling of 91604733867 in words is "ninety-one billion, six hundred four million, seven hundred thirty-three thousand, eight hundred sixty-seven".