11565565055 has 16 divisors (see below), whose sum is σ = 15142577184. Its totient is φ = 8410097280.

The previous prime is 11565564979. The next prime is 11565565087. The reversal of 11565565055 is 55056556511.

It is not a de Polignac number, because 11565565055 - 2⁸ = 11565564799 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11565564997 and 11565565015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 564857 + ... + 584973.

It is an arithmetic number, because the mean of its divisors is an integer number (946411074).

Almost surely, 2^11565565055 is an apocalyptic number.

11565565055 is a deficient number, since it is larger than the sum of its proper divisors (3577012129).

11565565055 is a wasteful number, since it uses less digits than its factorization.

11565565055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30586.

The product of its (nonzero) digits is 562500, while the sum is 44.

It can be divided in two parts, 1156556 and 5055, that added together give a palindrome (1161611).

The spelling of 11565565055 in words is "eleven billion, five hundred sixty-five million, five hundred sixty-five thousand, fifty-five".