11556331617 has 4 divisors (see below), whose sum is σ = 15408442160. Its totient is φ = 7704221076.

The previous prime is 11556331607. The next prime is 11556331637. The reversal of 11556331617 is 71613365511.

It is a happy number.

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 not a de Polignac number, because 11556331617 - 2⁸ = 11556331361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11556331607) 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, 1926055267 + ... + 1926055272.

It is an arithmetic number, because the mean of its divisors is an integer number (3852110540).

Almost surely, 2^11556331617 is an apocalyptic number.

It is an amenable number.

11556331617 is a deficient number, since it is larger than the sum of its proper divisors (3852110543).

11556331617 is an equidigital number, since it uses as much as digits as its factorization.

11556331617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3852110542.

The product of its digits is 56700, while the sum is 39.

The spelling of 11556331617 in words is "eleven billion, five hundred fifty-six million, three hundred thirty-one thousand, six hundred seventeen".