22818665 has 4 divisors (see below), whose sum is σ = 27382404. Its totient is φ = 18254928.

The previous prime is 22818643. The next prime is 22818671. The reversal of 22818665 is 56681822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56681822 = 2 ⋅28340911.

It can be written as a sum of positive squares in 2 ways, for example, as 9916201 + 12902464 = 3149^2 + 3592^2 .

It is a cyclic number.

It is not a de Polignac number, because 22818665 - 2⁸ = 22818409 is a prime.

It is a Duffinian 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, 2281862 + ... + 2281871.

It is an arithmetic number, because the mean of its divisors is an integer number (6845601).

Almost surely, 2^22818665 is an apocalyptic number.

It is an amenable number.

22818665 is a deficient number, since it is larger than the sum of its proper divisors (4563739).

22818665 is an equidigital number, since it uses as much as digits as its factorization.

22818665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4563738.

The product of its digits is 46080, while the sum is 38.

The square root of 22818665 is about 4776.8886317351. Note that the first 3 decimals coincide. The cubic root of 22818665 is about 283.6373445809.

The spelling of 22818665 in words is "twenty-two million, eight hundred eighteen thousand, six hundred sixty-five".