256669225 has 12 divisors (see below), whose sum is σ = 326033820. Its totient is φ = 200326400.

The previous prime is 256669223. The next prime is 256669261. The reversal of 256669225 is 522966652.

It can be written as a sum of positive squares in 6 ways, for example, as 45751696 + 210917529 = 6764^2 + 14523^2 .

It is not a de Polignac number, because 256669225 - 2¹ = 256669223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256669223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124180 + ... + 126229.

It is an arithmetic number, because the mean of its divisors is an integer number (27169485).

Almost surely, 2^256669225 is an apocalyptic number.

256669225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256669225 is a deficient number, since it is larger than the sum of its proper divisors (69364595).

256669225 is a wasteful number, since it uses less digits than its factorization.

256669225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250460 (or 250455 counting only the distinct ones).

The product of its digits is 388800, while the sum is 43.

The square root of 256669225 is about 16020.8996314190. The cubic root of 256669225 is about 635.5132354290.

The spelling of 256669225 in words is "two hundred fifty-six million, six hundred sixty-nine thousand, two hundred twenty-five".