91597194240 has 264 divisors, whose sum is σ = 309217527360. Its totient is φ = 23138942976.

The previous prime is 91597194229. The next prime is 91597194257. The reversal of 91597194240 is 4249179519.

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, 5536701 + ... + 5553219.

Almost surely, 2^91597194240 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 91597194240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154608763680).

91597194240 is an abundant number, since it is smaller than the sum of its proper divisors (217620333120).

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

91597194240 is a wasteful number, since it uses less digits than its factorization.

91597194240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16585 (or 16548 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 51.

The spelling of 91597194240 in words is "ninety-one billion, five hundred ninety-seven million, one hundred ninety-four thousand, two hundred forty".