256206855 has 8 divisors (see below), whose sum is σ = 409930992. Its totient is φ = 136643648.

The previous prime is 256206829. The next prime is 256206869. The reversal of 256206855 is 558602652.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 256206855 - 2⁶ = 256206791 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8540214 + ... + 8540243.

It is an arithmetic number, because the mean of its divisors is an integer number (51241374).

Almost surely, 2^256206855 is an apocalyptic number.

256206855 is a deficient number, since it is larger than the sum of its proper divisors (153724137).

256206855 is a wasteful number, since it uses less digits than its factorization.

256206855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17080465.

The product of its (nonzero) digits is 144000, while the sum is 39.

The square root of 256206855 is about 16006.4629134609. The cubic root of 256206855 is about 635.1313965386.

The spelling of 256206855 in words is "two hundred fifty-six million, two hundred six thousand, eight hundred fifty-five".