22551665 has 4 divisors (see below), whose sum is σ = 27062004. Its totient is φ = 18041328.

The previous prime is 22551653. The next prime is 22551667. The reversal of 22551665 is 56615522.

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 4844401 + 17707264 = 2201^2 + 4208^2 .

It is a cyclic number.

It is not a de Polignac number, because 22551665 - 2⁴ = 22551649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22551667) 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 3 ways as a sum of consecutive naturals, for example, 2255162 + ... + 2255171.

It is an arithmetic number, because the mean of its divisors is an integer number (6765501).

Almost surely, 2^22551665 is an apocalyptic number.

It is an amenable number.

22551665 is a deficient number, since it is larger than the sum of its proper divisors (4510339).

22551665 is an equidigital number, since it uses as much as digits as its factorization.

22551665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4510338.

The product of its digits is 18000, while the sum is 32.

The square root of 22551665 is about 4748.8593367250. The cubic root of 22551665 is about 282.5267262678.

The spelling of 22551665 in words is "twenty-two million, five hundred fifty-one thousand, six hundred sixty-five".