225665285 has 8 divisors (see below), whose sum is σ = 273841560. Its totient is φ = 178503424.

The previous prime is 225665243. The next prime is 225665287. The reversal of 225665285 is 582566522.

It can be written as a sum of positive squares in 4 ways, for example, as 57729604 + 167935681 = 7598^2 + 12959^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 225665285 - 2⁶ = 225665221 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225665287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253112 + ... + 254001.

It is an arithmetic number, because the mean of its divisors is an integer number (34230195).

Almost surely, 2^225665285 is an apocalyptic number.

It is an amenable number.

225665285 is a deficient number, since it is larger than the sum of its proper divisors (48176275).

225665285 is an equidigital number, since it uses as much as digits as its factorization.

225665285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507207.

The product of its digits is 288000, while the sum is 41.

The square root of 225665285 is about 15022.1597981116. The cubic root of 225665285 is about 608.8190760215.

The spelling of 225665285 in words is "two hundred twenty-five million, six hundred sixty-five thousand, two hundred eighty-five".