91540979712 has 640 divisors, whose sum is σ = 337489521600. Its totient is φ = 24078974976.

The previous prime is 91540979641. The next prime is 91540979737. The reversal of 91540979712 is 21797904519.

91540979712 is a `hidden beast` number, since 9 + 1 + 540 + 9 + 7 + 97 + 1 + 2 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 241532739 + ... + 241533117.

Almost surely, 2^91540979712 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 91540979712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168744760800).

91540979712 is an abundant number, since it is smaller than the sum of its proper divisors (245948541888).

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

91540979712 is an equidigital number, since it uses as much as digits as its factorization.

91540979712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 54.

The spelling of 91540979712 in words is "ninety-one billion, five hundred forty million, nine hundred seventy-nine thousand, seven hundred twelve".