22066865 has 4 divisors (see below), whose sum is σ = 26480244. Its totient is φ = 17653488.

The previous prime is 22066861. The next prime is 22066903. The reversal of 22066865 is 56866022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56866022 = 2 ⋅28433011.

It can be written as a sum of positive squares in 2 ways, for example, as 4661281 + 17405584 = 2159^2 + 4172^2 .

It is a cyclic number.

It is not a de Polignac number, because 22066865 - 2² = 22066861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22066861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2206682 + ... + 2206691.

It is an arithmetic number, because the mean of its divisors is an integer number (6620061).

Almost surely, 2^22066865 is an apocalyptic number.

It is an amenable number.

22066865 is a deficient number, since it is larger than the sum of its proper divisors (4413379).

22066865 is an equidigital number, since it uses as much as digits as its factorization.

22066865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4413378.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 22066865 is about 4697.5381850497. The cubic root of 22066865 is about 280.4875222562.

The spelling of 22066865 in words is "twenty-two million, sixty-six thousand, eight hundred sixty-five".