91996133868 has 36 divisors (see below), whose sum is σ = 232629775560. Its totient is φ = 30654302016.

The previous prime is 91996133857. The next prime is 91996133893. The reversal of 91996133868 is 86833169919.

91996133868 is a `hidden beast` number, since 9 + 1 + 9 + 9 + 613 + 3 + 8 + 6 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 360138 + ... + 560081.

It is an arithmetic number, because the mean of its divisors is an integer number (6461938210).

Almost surely, 2^91996133868 is an apocalyptic number.

It is an amenable number.

91996133868 is an abundant number, since it is smaller than the sum of its proper divisors (140633641692).

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

91996133868 is a wasteful number, since it uses less digits than its factorization.

91996133868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923006 (or 923001 counting only the distinct ones).

The product of its digits is 15116544, while the sum is 63.

The spelling of 91996133868 in words is "ninety-one billion, nine hundred ninety-six million, one hundred thirty-three thousand, eight hundred sixty-eight".