12665565 has 40 divisors (see below), whose sum is σ = 24776928. Its totient is φ = 6138720.

The previous prime is 12665563. The next prime is 12665593. The reversal of 12665565 is 56556621.

It is a happy number.

12665565 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12665565 - 2¹ = 12665563 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12665563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3034 + ... + 5876.

Almost surely, 2^12665565 is an apocalyptic number.

12665565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12665565 is a deficient number, since it is larger than the sum of its proper divisors (12111363).

12665565 is a wasteful number, since it uses less digits than its factorization.

12665565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2871 (or 2862 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 12665565 is about 3558.8713098397. The cubic root of 12665565 is about 233.0995970039.

The spelling of 12665565 in words is "twelve million, six hundred sixty-five thousand, five hundred sixty-five".