225566857 has 2 divisors, whose sum is σ = 225566858. Its totient is φ = 225566856.

The previous prime is 225566833. The next prime is 225566899. The reversal of 225566857 is 758665522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202179961 + 23386896 = 14219^2 + 4836^2 .

It is a cyclic number.

It is not a de Polignac number, because 225566857 - 2⁷ = 225566729 is a prime.

It is not a weakly prime, because it can be changed into another prime (225566827) 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 as a sum of consecutive naturals, namely, 112783428 + 112783429.

It is an arithmetic number, because the mean of its divisors is an integer number (112783429).

Almost surely, 2^225566857 is an apocalyptic number.

It is an amenable number.

225566857 is a deficient number, since it is larger than the sum of its proper divisors (1).

225566857 is an equidigital number, since it uses as much as digits as its factorization.

225566857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008000, while the sum is 46.

The square root of 225566857 is about 15018.8833473065. The cubic root of 225566857 is about 608.7305473280.

The spelling of 225566857 in words is "two hundred twenty-five million, five hundred sixty-six thousand, eight hundred fifty-seven".