91116789826 has 32 divisors (see below), whose sum is σ = 140408156160. Its totient is φ = 44332142400.

The previous prime is 91116789821. The next prime is 91116789901. The reversal of 91116789826 is 62898761119.

It is a super-2 number, since 2×91116789826² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91116789821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5554156 + ... + 5570536.

It is an arithmetic number, because the mean of its divisors is an integer number (4387754880).

Almost surely, 2^91116789826 is an apocalyptic number.

91116789826 is a deficient number, since it is larger than the sum of its proper divisors (49291366334).

91116789826 is a wasteful number, since it uses less digits than its factorization.

91116789826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16930.

The product of its digits is 2612736, while the sum is 58.

The spelling of 91116789826 in words is "ninety-one billion, one hundred sixteen million, seven hundred eighty-nine thousand, eight hundred twenty-six".