256371655 has 8 divisors (see below), whose sum is σ = 323838000. Its totient is φ = 194302656.

The previous prime is 256371637. The next prime is 256371667. The reversal of 256371655 is 556173652.

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 256371655 - 2⁵ = 256371623 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, 1349230 + ... + 1349419.

It is an arithmetic number, because the mean of its divisors is an integer number (40479750).

Almost surely, 2^256371655 is an apocalyptic number.

256371655 is a deficient number, since it is larger than the sum of its proper divisors (67466345).

256371655 is a wasteful number, since it uses less digits than its factorization.

256371655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2698673.

The product of its digits is 189000, while the sum is 40.

The square root of 256371655 is about 16011.6100064922. The cubic root of 256371655 is about 635.2675459271.

The spelling of 256371655 in words is "two hundred fifty-six million, three hundred seventy-one thousand, six hundred fifty-five".