91866995712 has 264 divisors, whose sum is σ = 279120437232. Its totient is φ = 29063577600.

The previous prime is 91866995699. The next prime is 91866995743. The reversal of 91866995712 is 21759966819.

It is a super-2 number, since 2×91866995712² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91866995712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13977387 + ... + 13983957.

Almost surely, 2^91866995712 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 91866995712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139560218616).

91866995712 is an abundant number, since it is smaller than the sum of its proper divisors (187253441520).

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

91866995712 is a wasteful number, since it uses less digits than its factorization.

91866995712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6675 (or 6654 counting only the distinct ones).

The product of its digits is 14696640, while the sum is 63.

The spelling of 91866995712 in words is "ninety-one billion, eight hundred sixty-six million, nine hundred ninety-five thousand, seven hundred twelve".