256319655 has 32 divisors (see below), whose sum is σ = 416047104. Its totient is φ = 134741376.

The previous prime is 256319653. The next prime is 256319663. The reversal of 256319655 is 556913652.

256319655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256319655 - 2¹ = 256319653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256319653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 374944 + ... + 375626.

It is an arithmetic number, because the mean of its divisors is an integer number (13001472).

Almost surely, 2^256319655 is an apocalyptic number.

256319655 is a deficient number, since it is larger than the sum of its proper divisors (159727449).

256319655 is a wasteful number, since it uses less digits than its factorization.

256319655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015.

The product of its digits is 243000, while the sum is 42.

The square root of 256319655 is about 16009.9861024299. The cubic root of 256319655 is about 635.2245924708.

The spelling of 256319655 in words is "two hundred fifty-six million, three hundred nineteen thousand, six hundred fifty-five".