11565565056 has 96 divisors (see below), whose sum is σ = 33521014800. Its totient is φ = 3827400192.

The previous prime is 11565564979. The next prime is 11565565087. The reversal of 11565565056 is 65056556511.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124015 + ... + 196241.

Almost surely, 2^11565565056 is an apocalyptic number.

11565565056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11565565056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16760507400).

11565565056 is an abundant number, since it is smaller than the sum of its proper divisors (21955449744).

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

11565565056 is a wasteful number, since it uses less digits than its factorization.

11565565056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72386 (or 72371 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 45.

It can be divided in two parts, 1156556505 and 6, that added together give a palindrome (1156556511).

The spelling of 11565565056 in words is "eleven billion, five hundred sixty-five million, five hundred sixty-five thousand, fifty-six".