11590643521 has 4 divisors (see below), whose sum is σ = 11592201172. Its totient is φ = 11589085872.

The previous prime is 11590643509. The next prime is 11590643551. The reversal of 11590643521 is 12534609511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7946831025 + 3643812496 = 89145^2 + 60364^2 .

It is a cyclic number.

It is not a de Polignac number, because 11590643521 - 2²³ = 11582254913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11590643551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 767610 + ... + 782563.

It is an arithmetic number, because the mean of its divisors is an integer number (2898050293).

Almost surely, 2^11590643521 is an apocalyptic number.

It is an amenable number.

11590643521 is a deficient number, since it is larger than the sum of its proper divisors (1557651).

11590643521 is an equidigital number, since it uses as much as digits as its factorization.

11590643521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557650.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 11590643521 in words is "eleven billion, five hundred ninety million, six hundred forty-three thousand, five hundred twenty-one".