91616403440 has 20 divisors (see below), whose sum is σ = 213008138184. Its totient is φ = 36646561344.

The previous prime is 91616403427. The next prime is 91616403497. The reversal of 91616403440 is 4430461619.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 91616403394 and 91616403403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 572602442 + ... + 572602601.

Almost surely, 2^91616403440 is an apocalyptic number.

It is an amenable number.

91616403440 is an abundant number, since it is smaller than the sum of its proper divisors (121391734744).

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

91616403440 is a wasteful number, since it uses less digits than its factorization.

91616403440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145205056 (or 1145205050 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 91616403440 in words is "ninety-one billion, six hundred sixteen million, four hundred three thousand, four hundred forty".