225565665 has 16 divisors (see below), whose sum is σ = 388667328. Its totient is φ = 111047616.

The previous prime is 225565657. The next prime is 225565667. The reversal of 225565665 is 566565522.

It is not a de Polignac number, because 225565665 - 2³ = 225565657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (225565667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 578179 + ... + 578568.

It is an arithmetic number, because the mean of its divisors is an integer number (24291708).

Almost surely, 2^225565665 is an apocalyptic number.

It is an amenable number.

225565665 is a deficient number, since it is larger than the sum of its proper divisors (163101663).

225565665 is a wasteful number, since it uses less digits than its factorization.

225565665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156768.

The product of its digits is 540000, while the sum is 42.

The square root of 225565665 is about 15018.8436638777. The cubic root of 225565665 is about 608.7294750545.

The spelling of 225565665 in words is "two hundred twenty-five million, five hundred sixty-five thousand, six hundred sixty-five".