10991011590 has 48 divisors (see below), whose sum is σ = 30774835728. Its totient is φ = 2705479488.

The previous prime is 10991011553. The next prime is 10991011609. The reversal of 10991011590 is 9511019901.

It is a congruent number.

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, 4695844 + ... + 4698183.

It is an arithmetic number, because the mean of its divisors is an integer number (641142411).

Almost surely, 2^10991011590 is an apocalyptic number.

10991011590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

10991011590 is an abundant number, since it is smaller than the sum of its proper divisors (19783824138).

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

10991011590 is a wasteful number, since it uses less digits than its factorization.

10991011590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9394053 (or 9394050 counting only the distinct ones).

The product of its (nonzero) digits is 3645, while the sum is 36.

The spelling of 10991011590 in words is "ten billion, nine hundred ninety-one million, eleven thousand, five hundred ninety".