91816015040 has 112 divisors (see below), whose sum is σ = 224793304032. Its totient is φ = 35694452736.

The previous prime is 91816015021. The next prime is 91816015073. The reversal of 91816015040 is 4051061819.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12226967 + ... + 12234473.

Almost surely, 2^91816015040 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 91816015040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112396652016).

91816015040 is an abundant number, since it is smaller than the sum of its proper divisors (132977288992).

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

91816015040 is a wasteful number, since it uses less digits than its factorization.

91816015040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8594 (or 8584 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 35.

Adding to 91816015040 its reverse (4051061819), we get a palindrome (95867076859).

The spelling of 91816015040 in words is "ninety-one billion, eight hundred sixteen million, fifteen thousand, forty".