12565565 has 4 divisors (see below), whose sum is σ = 15078684. Its totient is φ = 10052448.

The previous prime is 12565561. The next prime is 12565603. The reversal of 12565565 is 56556521.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6360484 + 6205081 = 2522^2 + 2491^2 .

It is a cyclic number.

It is not a de Polignac number, because 12565565 - 2² = 12565561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12565561) 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, 1256552 + ... + 1256561.

It is an arithmetic number, because the mean of its divisors is an integer number (3769671).

Almost surely, 2^12565565 is an apocalyptic number.

It is an amenable number.

12565565 is a deficient number, since it is larger than the sum of its proper divisors (2513119).

12565565 is an equidigital number, since it uses as much as digits as its factorization.

12565565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2513118.

The product of its digits is 45000, while the sum is 35.

The square root of 12565565 is about 3544.7940701824. The cubic root of 12565565 is about 232.4845019924.

The spelling of 12565565 in words is "twelve million, five hundred sixty-five thousand, five hundred sixty-five".