91611868608 has 504 divisors, whose sum is σ = 302969066400. Its totient is φ = 26278318080.

The previous prime is 91611868591. The next prime is 91611868657. The reversal of 91611868608 is 80686811619.

91611868608 is a `hidden beast` number, since 9 + 16 + 1 + 18 + 6 + 8 + 608 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 208682853 + ... + 208683291.

It is an arithmetic number, because the mean of its divisors is an integer number (601129100).

Almost surely, 2^91611868608 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 91611868608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151484533200).

91611868608 is an abundant number, since it is smaller than the sum of its proper divisors (211357197792).

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

91611868608 is a wasteful number, since it uses less digits than its factorization.

91611868608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561 (or 517 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 54.

The spelling of 91611868608 in words is "ninety-one billion, six hundred eleven million, eight hundred sixty-eight thousand, six hundred eight".