91906633854 has 256 divisors, whose sum is σ = 243074304000. Its totient is φ = 25198967808.

The previous prime is 91906633837. The next prime is 91906633867. The reversal of 91906633854 is 45833660919.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 91906633854.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 331792764 + ... + 331793040.

It is an arithmetic number, because the mean of its divisors is an integer number (949509000).

Almost surely, 2^91906633854 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91906633854, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121537152000).

91906633854 is an abundant number, since it is smaller than the sum of its proper divisors (151167670146).

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

91906633854 is a wasteful number, since it uses less digits than its factorization.

91906633854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624 (or 618 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 54.

The spelling of 91906633854 in words is "ninety-one billion, nine hundred six million, six hundred thirty-three thousand, eight hundred fifty-four".