256551525 has 36 divisors (see below), whose sum is σ = 471946852. Its totient is φ = 133125120.

The previous prime is 256551497. The next prime is 256551527. The reversal of 256551525 is 525155652.

256551525 is a `hidden beast` number, since 2 + 56 + 551 + 52 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 10751841 + 245799684 = 3279^2 + 15678^2 .

It is not a de Polignac number, because 256551525 - 2¹² = 256547429 is a prime.

It is a Duffinian number.

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 256551525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256551527) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7084 + ... + 23733.

Almost surely, 2^256551525 is an apocalyptic number.

256551525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256551525 is a deficient number, since it is larger than the sum of its proper divisors (215395327).

256551525 is a wasteful number, since it uses less digits than its factorization.

256551525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30870 (or 30862 counting only the distinct ones).

The product of its digits is 75000, while the sum is 36.

The square root of 256551525 is about 16017.2258834044. The cubic root of 256551525 is about 635.4160788074.

The spelling of 256551525 in words is "two hundred fifty-six million, five hundred fifty-one thousand, five hundred twenty-five".