256351855 has 8 divisors (see below), whose sum is σ = 308325600. Its totient is φ = 204612576.

The previous prime is 256351841. The next prime is 256351861. The reversal of 256351855 is 558153652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256351855 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56200 + ... + 60589.

It is an arithmetic number, because the mean of its divisors is an integer number (38540700).

Almost surely, 2^256351855 is an apocalyptic number.

256351855 is a deficient number, since it is larger than the sum of its proper divisors (51973745).

256351855 is a wasteful number, since it uses less digits than its factorization.

256351855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117233.

The product of its digits is 180000, while the sum is 40.

The square root of 256351855 is about 16010.9916932088. The cubic root of 256351855 is about 635.2511912574.

The spelling of 256351855 in words is "two hundred fifty-six million, three hundred fifty-one thousand, eight hundred fifty-five".