11565541563 has 4 divisors (see below), whose sum is σ = 15420722088. Its totient is φ = 7710361040.

The previous prime is 11565541553. The next prime is 11565541567. The reversal of 11565541563 is 36514556511.

11565541563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11565541563 - 2¹⁷ = 11565410491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11565541567) 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 3 ways as a sum of consecutive naturals, for example, 1927590258 + ... + 1927590263.

It is an arithmetic number, because the mean of its divisors is an integer number (3855180522).

Almost surely, 2^11565541563 is an apocalyptic number.

11565541563 is a deficient number, since it is larger than the sum of its proper divisors (3855180525).

11565541563 is an equidigital number, since it uses as much as digits as its factorization.

11565541563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3855180524.

The product of its digits is 270000, while the sum is 42.

The spelling of 11565541563 in words is "eleven billion, five hundred sixty-five million, five hundred forty-one thousand, five hundred sixty-three".