11556331613 has 4 divisors (see below), whose sum is σ = 11695564608. Its totient is φ = 11417098620.

The previous prime is 11556331607. The next prime is 11556331637. The reversal of 11556331613 is 31613365511.

11556331613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11556331613 - 2¹⁴ = 11556315229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11556331663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69616373 + ... + 69616538.

It is an arithmetic number, because the mean of its divisors is an integer number (2923891152).

Almost surely, 2^11556331613 is an apocalyptic number.

It is an amenable number.

11556331613 is a deficient number, since it is larger than the sum of its proper divisors (139232995).

11556331613 is an equidigital number, since it uses as much as digits as its factorization.

11556331613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139232994.

The product of its digits is 24300, while the sum is 35.

The spelling of 11556331613 in words is "eleven billion, five hundred fifty-six million, three hundred thirty-one thousand, six hundred thirteen".