91616577584 has 80 divisors (see below), whose sum is σ = 213669300480. Its totient is φ = 37175604480.

The previous prime is 91616577583. The next prime is 91616577617. The reversal of 91616577584 is 48577561619.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (91616577581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3841922 + ... + 3865694.

It is an arithmetic number, because the mean of its divisors is an integer number (2670866256).

Almost surely, 2^91616577584 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 91616577584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106834650240).

91616577584 is an abundant number, since it is smaller than the sum of its proper divisors (122052722896).

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

91616577584 is a wasteful number, since it uses less digits than its factorization.

91616577584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25618 (or 25612 counting only the distinct ones).

The product of its digits is 12700800, while the sum is 59.

The spelling of 91616577584 in words is "ninety-one billion, six hundred sixteen million, five hundred seventy-seven thousand, five hundred eighty-four".