91916328897 has 24 divisors (see below), whose sum is σ = 133056775488. Its totient is φ = 61144437600.

The previous prime is 91916328869. The next prime is 91916328923. The reversal of 91916328897 is 79882361919.

It is not a de Polignac number, because 91916328897 - 2³² = 87621361601 is a prime.

It is a super-2 number, since 2×91916328897² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91916328797) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8614788 + ... + 8625450.

It is an arithmetic number, because the mean of its divisors is an integer number (5544032312).

Almost surely, 2^91916328897 is an apocalyptic number.

It is an amenable number.

91916328897 is a deficient number, since it is larger than the sum of its proper divisors (41140446591).

91916328897 is a wasteful number, since it uses less digits than its factorization.

91916328897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12661 (or 12658 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 63.

The spelling of 91916328897 in words is "ninety-one billion, nine hundred sixteen million, three hundred twenty-eight thousand, eight hundred ninety-seven".