256530555 has 12 divisors (see below), whose sum is σ = 444653040. Its totient is φ = 136816272.

The previous prime is 256530529. The next prime is 256530581. The reversal of 256530555 is 555035652.

256530555 is a `hidden beast` number, since 2 + 56 + 53 + 0 + 555 = 666.

It is an interprime number because it is at equal distance from previous prime (256530529) and next prime (256530581).

It is not a de Polignac number, because 256530555 - 2⁸ = 256530299 is a prime.

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, 2850295 + ... + 2850384.

It is an arithmetic number, because the mean of its divisors is an integer number (37054420).

Almost surely, 2^256530555 is an apocalyptic number.

256530555 is a deficient number, since it is larger than the sum of its proper divisors (188122485).

256530555 is a wasteful number, since it uses less digits than its factorization.

256530555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5700690 (or 5700687 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 36.

The square root of 256530555 is about 16016.5712622896. The cubic root of 256530555 is about 635.3987657963.

The spelling of 256530555 in words is "two hundred fifty-six million, five hundred thirty thousand, five hundred fifty-five".