22499665 has 4 divisors (see below), whose sum is σ = 26999604. Its totient is φ = 17999728.

The previous prime is 22499657. The next prime is 22499683. The reversal of 22499665 is 56699422.

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 5755201 + 16744464 = 2399^2 + 4092^2 .

It is a cyclic number.

It is not a de Polignac number, because 22499665 - 2³ = 22499657 is a prime.

It is a super-2 number, since 2×22499665² = 1012469850224450, which contains 22 as substring.

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, 2249962 + ... + 2249971.

It is an arithmetic number, because the mean of its divisors is an integer number (6749901).

Almost surely, 2^22499665 is an apocalyptic number.

It is an amenable number.

22499665 is a deficient number, since it is larger than the sum of its proper divisors (4499939).

22499665 is an equidigital number, since it uses as much as digits as its factorization.

22499665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4499938.

The product of its digits is 233280, while the sum is 43.

The square root of 22499665 is about 4743.3811780206. The cubic root of 22499665 is about 282.3094075593.

The spelling of 22499665 in words is "twenty-two million, four hundred ninety-nine thousand, six hundred sixty-five".