256806158 has 20 divisors (see below), whose sum is σ = 449392440. Its totient is φ = 110057724.

The previous prime is 256806149. The next prime is 256806161. The reversal of 256806158 is 851608652.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 21938 + ... + 31541.

It is an arithmetic number, because the mean of its divisors is an integer number (22469622).

Almost surely, 2^256806158 is an apocalyptic number.

256806158 is a deficient number, since it is larger than the sum of its proper divisors (192586282).

256806158 is an frugal number, since it uses more digits than its factorization.

256806158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53509 (or 53488 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 256806158 is about 16025.1726355756. The cubic root of 256806158 is about 635.6262307481.

The spelling of 256806158 in words is "two hundred fifty-six million, eight hundred six thousand, one hundred fifty-eight".