91063565712 has 640 divisors, whose sum is σ = 337349836800. Its totient is φ = 23178700800.

The previous prime is 91063565707. The next prime is 91063565839. The reversal of 91063565712 is 21756536019.

91063565712 is a `hidden beast` number, since 9 + 1 + 0 + 635 + 6 + 5 + 7 + 1 + 2 = 666.

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, 79116337 + ... + 79117487.

It is an arithmetic number, because the mean of its divisors is an integer number (527109120).

Almost surely, 2^91063565712 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 91063565712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168674918400).

91063565712 is an abundant number, since it is smaller than the sum of its proper divisors (246286271088).

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

91063565712 is a wasteful number, since it uses less digits than its factorization.

91063565712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223 (or 1199 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 45.

The spelling of 91063565712 in words is "ninety-one billion, sixty-three million, five hundred sixty-five thousand, seven hundred twelve".