13991522560 has 36 divisors (see below), whose sum is σ = 33514071948. Its totient is φ = 5596608512.

The previous prime is 13991522533. The next prime is 13991522579. The reversal of 13991522560 is 6522519931.

It can be written as a sum of positive squares in 2 ways, for example, as 4176261376 + 9815261184 = 64624^2 + 99072^2 .

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, 5464159 + ... + 5466718.

It is an arithmetic number, because the mean of its divisors is an integer number (930946443).

Almost surely, 2^13991522560 is an apocalyptic number.

13991522560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13991522560 is an abundant number, since it is smaller than the sum of its proper divisors (19522549388).

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

13991522560 is an equidigital number, since it uses as much as digits as its factorization.

13991522560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10930898 (or 10930884 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 43.

The spelling of 13991522560 in words is "thirteen billion, nine hundred ninety-one million, five hundred twenty-two thousand, five hundred sixty".