11566556243 has 16 divisors (see below), whose sum is σ = 13058379360. Its totient is φ = 10148409600.

The previous prime is 11566556219. The next prime is 11566556251. The reversal of 11566556243 is 34265566511.

11566556243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11566556243 - 2¹⁰ = 11566555219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11566556194 and 11566556203.

It is not an unprimeable number, because it can be changed into a prime (11566556213) 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 15 ways as a sum of consecutive naturals, for example, 1021871 + ... + 1033127.

It is an arithmetic number, because the mean of its divisors is an integer number (816148710).

Almost surely, 2^11566556243 is an apocalyptic number.

11566556243 is a deficient number, since it is larger than the sum of its proper divisors (1491823117).

11566556243 is a wasteful number, since it uses less digits than its factorization.

11566556243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14518.

The product of its digits is 648000, while the sum is 44.

The spelling of 11566556243 in words is "eleven billion, five hundred sixty-six million, five hundred fifty-six thousand, two hundred forty-three".