91373943744 has 168 divisors, whose sum is σ = 268309636608. Its totient is φ = 29721323520.

The previous prime is 91373943743. The next prime is 91373943757. The reversal of 91373943744 is 44734937319.

91373943744 is a `hidden beast` number, since 9 + 137 + 39 + 437 + 44 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91373943743) 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 23 ways as a sum of consecutive naturals, for example, 4452034 + ... + 4472510.

Almost surely, 2^91373943744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91373943744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134154818304).

91373943744 is an abundant number, since it is smaller than the sum of its proper divisors (176935692864).

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

91373943744 is a wasteful number, since it uses less digits than its factorization.

91373943744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20683 (or 20670 counting only the distinct ones).

The product of its digits is 6858432, while the sum is 54.

The spelling of 91373943744 in words is "ninety-one billion, three hundred seventy-three million, nine hundred forty-three thousand, seven hundred forty-four".