256559725 has 12 divisors (see below), whose sum is σ = 319788436. Its totient is φ = 204180480.

The previous prime is 256559659. The next prime is 256559747. The reversal of 256559725 is 527955652.

It can be written as a sum of positive squares in 6 ways, for example, as 13293316 + 243266409 = 3646^2 + 15597^2 .

It is a de Polignac number, because none of the positive numbers 2^k-256559725 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21762 + ... + 31411.

Almost surely, 2^256559725 is an apocalyptic number.

256559725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256559725 is a deficient number, since it is larger than the sum of its proper divisors (63228711).

256559725 is a wasteful number, since it uses less digits than its factorization.

256559725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53376 (or 53371 counting only the distinct ones).

The product of its digits is 945000, while the sum is 46.

The square root of 256559725 is about 16017.4818557725. The cubic root of 256559725 is about 635.4228485409.

The spelling of 256559725 in words is "two hundred fifty-six million, five hundred fifty-nine thousand, seven hundred twenty-five".