12165565 has 4 divisors (see below), whose sum is σ = 14598684. Its totient is φ = 9732448.

The previous prime is 12165497. The next prime is 12165581. The reversal of 12165565 is 56556121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56556121 = 31 ⋅1824391.

It can be written as a sum of positive squares in 2 ways, for example, as 1855044 + 10310521 = 1362^2 + 3211^2 .

It is a cyclic number.

It is not a de Polignac number, because 12165565 - 2¹⁵ = 12132797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1216552 + ... + 1216561.

It is an arithmetic number, because the mean of its divisors is an integer number (3649671).

Almost surely, 2^12165565 is an apocalyptic number.

It is an amenable number.

12165565 is a deficient number, since it is larger than the sum of its proper divisors (2433119).

12165565 is an equidigital number, since it uses as much as digits as its factorization.

12165565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2433118.

The product of its digits is 9000, while the sum is 31.

The square root of 12165565 is about 3487.9170001593. The cubic root of 12165565 is about 229.9909574265.

The spelling of 12165565 in words is "twelve million, one hundred sixty-five thousand, five hundred sixty-five".