256655530 has 32 divisors (see below), whose sum is σ = 469281600. Its totient is φ = 101050752.

The previous prime is 256655527. The next prime is 256655533. The reversal of 256655530 is 35556652.

It is an interprime number because it is at equal distance from previous prime (256655527) and next prime (256655533).

It is a super-2 number, since 2×256655530² = 131744122159161800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 256655530.

It is not an unprimeable number, because it can be changed into a prime (256655533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251361 + ... + 252379.

It is an arithmetic number, because the mean of its divisors is an integer number (14665050).

Almost surely, 2^256655530 is an apocalyptic number.

256655530 is a deficient number, since it is larger than the sum of its proper divisors (212626070).

256655530 is a wasteful number, since it uses less digits than its factorization.

256655530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398.

The product of its (nonzero) digits is 135000, while the sum is 37.

The square root of 256655530 is about 16020.4722152626. The cubic root of 256655530 is about 635.5019322838.

The spelling of 256655530 in words is "two hundred fifty-six million, six hundred fifty-five thousand, five hundred thirty".