256560525 has 72 divisors (see below), whose sum is σ = 498301440. Its totient is φ = 125435520.

The previous prime is 256560523. The next prime is 256560529. The reversal of 256560525 is 525065652.

256560525 is a `hidden beast` number, since 25 + 6 + 5 + 605 + 25 = 666.

It is not a de Polignac number, because 256560525 - 2¹ = 256560523 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 256560525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256560523) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 698892 + ... + 699258.

Almost surely, 2^256560525 is an apocalyptic number.

256560525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256560525 is a deficient number, since it is larger than the sum of its proper divisors (241740915).

256560525 is a wasteful number, since it uses less digits than its factorization.

256560525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The square root of 256560525 is about 16017.5068284674. The cubic root of 256560525 is about 635.4235089950.

The spelling of 256560525 in words is "two hundred fifty-six million, five hundred sixty thousand, five hundred twenty-five".