91999956026 has 16 divisors (see below), whose sum is σ = 154614178080. Its totient is φ = 40687940880.

The previous prime is 91999955963. The next prime is 91999956049. The reversal of 91999956026 is 62065999919.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56510216 + ... + 56511843.

It is an arithmetic number, because the mean of its divisors is an integer number (9663386130).

Almost surely, 2^91999956026 is an apocalyptic number.

91999956026 is a deficient number, since it is larger than the sum of its proper divisors (62614222054).

91999956026 is a wasteful number, since it uses less digits than its factorization.

91999956026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113022109.

The product of its (nonzero) digits is 21257640, while the sum is 65.

The spelling of 91999956026 in words is "ninety-one billion, nine hundred ninety-nine million, nine hundred fifty-six thousand, twenty-six".