91584655668 has 96 divisors (see below), whose sum is σ = 266028174720. Its totient is φ = 27002833920.

The previous prime is 91584655637. The next prime is 91584655697. The reversal of 91584655668 is 86655648519.

It is a happy number.

91584655668 is a `hidden beast` number, since 9 + 1 + 5 + 8 + 4 + 65 + 566 + 8 = 666.

It is a super-2 number, since 2×91584655668² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 997821 + ... + 1085732.

It is an arithmetic number, because the mean of its divisors is an integer number (2771126820).

Almost surely, 2^91584655668 is an apocalyptic number.

It is an amenable number.

91584655668 is an abundant number, since it is smaller than the sum of its proper divisors (174443519052).

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

91584655668 is a wasteful number, since it uses less digits than its factorization.

91584655668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2083614 (or 2083606 counting only the distinct ones).

The product of its digits is 62208000, while the sum is 63.

The spelling of 91584655668 in words is "ninety-one billion, five hundred eighty-four million, six hundred fifty-five thousand, six hundred sixty-eight".