11531564056 has 32 divisors (see below), whose sum is σ = 22785764400. Its totient is φ = 5456056320.

The previous prime is 11531564053. The next prime is 11531564167. The reversal of 11531564056 is 65046513511.

11531564056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×11531564056² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11531564053) 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 7 ways as a sum of consecutive naturals, for example, 90856 + ... + 176968.

Almost surely, 2^11531564056 is an apocalyptic number.

It is an amenable number.

11531564056 is a deficient number, since it is larger than the sum of its proper divisors (11254200344).

11531564056 is a wasteful number, since it uses less digits than its factorization.

11531564056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87019 (or 87015 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 11531564056 in words is "eleven billion, five hundred thirty-one million, five hundred sixty-four thousand, fifty-six".