22555665 has 80 divisors (see below), whose sum is σ = 45372096. Its totient is φ = 10627200.

The previous prime is 22555639. The next prime is 22555667. The reversal of 22555665 is 56655522.

It is not a de Polignac number, because 22555665 - 2⁸ = 22555409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22555667) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 271714 + ... + 271796.

Almost surely, 2^22555665 is an apocalyptic number.

It is an amenable number.

22555665 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

22555665 is a wasteful number, since it uses less digits than its factorization.

22555665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 163 counting only the distinct ones).

The product of its digits is 90000, while the sum is 36.

The square root of 22555665 is about 4749.2804718189. The cubic root of 22555665 is about 282.5434292487.

It can be divided in two parts, 22555 and 665, that added together give a triangular number (23220 = T₂₁₅).

The spelling of 22555665 in words is "twenty-two million, five hundred fifty-five thousand, six hundred sixty-five".