115566565 has 4 divisors (see below), whose sum is σ = 138679884. Its totient is φ = 92453248.

The previous prime is 115566551. The next prime is 115566587. The reversal of 115566565 is 565665511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 565665511 = 19 ⋅29771869.

It can be written as a sum of positive squares in 2 ways, for example, as 11710084 + 103856481 = 3422^2 + 10191^2 .

It is a cyclic number.

It is not a de Polignac number, because 115566565 - 2⁵ = 115566533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 11556652 + ... + 11556661.

It is an arithmetic number, because the mean of its divisors is an integer number (34669971).

Almost surely, 2^115566565 is an apocalyptic number.

It is an amenable number.

115566565 is a deficient number, since it is larger than the sum of its proper divisors (23113319).

115566565 is an equidigital number, since it uses as much as digits as its factorization.

115566565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23113318.

The product of its digits is 135000, while the sum is 40.

The square root of 115566565 is about 10750.1890681048. The cubic root of 115566565 is about 487.0917063530.

The spelling of 115566565 in words is "one hundred fifteen million, five hundred sixty-six thousand, five hundred sixty-five".