22641565 has 4 divisors (see below), whose sum is σ = 27169884. Its totient is φ = 18113248.

The previous prime is 22641551. The next prime is 22641581. The reversal of 22641565 is 56514622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56514622 = 2 ⋅28257311.

It can be written as a sum of positive squares in 2 ways, for example, as 3378244 + 19263321 = 1838^2 + 4389^2 .

It is a cyclic number.

It is not a de Polignac number, because 22641565 - 2¹⁵ = 22608797 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 2264152 + ... + 2264161.

It is an arithmetic number, because the mean of its divisors is an integer number (6792471).

Almost surely, 2^22641565 is an apocalyptic number.

It is an amenable number.

22641565 is a deficient number, since it is larger than the sum of its proper divisors (4528319).

22641565 is an equidigital number, since it uses as much as digits as its factorization.

22641565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4528318.

The product of its digits is 14400, while the sum is 31.

The square root of 22641565 is about 4758.3153531476. The cubic root of 22641565 is about 282.9016502010.

The spelling of 22641565 in words is "twenty-two million, six hundred forty-one thousand, five hundred sixty-five".