256313655 has 24 divisors (see below), whose sum is σ = 478453248. Its totient is φ = 126184896.

The previous prime is 256313639. The next prime is 256313657. The reversal of 256313655 is 556313652.

It is not a de Polignac number, because 256313655 - 2⁴ = 256313639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256313657) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 218487 + ... + 219656.

It is an arithmetic number, because the mean of its divisors is an integer number (19935552).

Almost surely, 2^256313655 is an apocalyptic number.

256313655 is a deficient number, since it is larger than the sum of its proper divisors (222139593).

256313655 is a wasteful number, since it uses less digits than its factorization.

256313655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438167 (or 438164 counting only the distinct ones).

The product of its digits is 81000, while the sum is 36.

The square root of 256313655 is about 16009.7987182850. The cubic root of 256313655 is about 635.2196359289.

The spelling of 256313655 in words is "two hundred fifty-six million, three hundred thirteen thousand, six hundred fifty-five".