11563561156 has 27 divisors (see below), whose sum is σ = 23543171757. Its totient is φ = 4955166720.

The previous prime is 11563561151. The next prime is 11563561223. The reversal of 11563561156 is 65116536511.

The square root of 11563561156 is 107534.

It is a perfect power (a square), and thus also a powerful number.

11563561156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 8106121156 + 3457440000 = 90034^2 + 58800^2 .

It is not an unprimeable number, because it can be changed into a prime (11563561151) 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 8 ways as a sum of consecutive naturals, for example, 1501636 + ... + 1509316.

Almost surely, 2^11563561156 is an apocalyptic number.

11563561156 is the 107534-th square number.

It is an amenable number.

11563561156 is an abundant number, since it is smaller than the sum of its proper divisors (11979610601).

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

11563561156 is an frugal number, since it uses more digits than its factorization.

11563561156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15380 (or 7690 counting only the distinct ones).

The product of its digits is 81000, while the sum is 40.

The spelling of 11563561156 in words is "eleven billion, five hundred sixty-three million, five hundred sixty-one thousand, one hundred fifty-six".