256338655 has 8 divisors (see below), whose sum is σ = 308433312. Its totient is φ = 204519648.

The previous prime is 256338623. The next prime is 256338689. The reversal of 256338655 is 556833652.

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 256338655 - 2⁵ = 256338623 is a prime.

It is a Duffinian number.

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, 66859 + ... + 70588.

It is an arithmetic number, because the mean of its divisors is an integer number (38554164).

Almost surely, 2^256338655 is an apocalyptic number.

256338655 is a deficient number, since it is larger than the sum of its proper divisors (52094657).

256338655 is a wasteful number, since it uses less digits than its factorization.

256338655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137825.

The product of its digits is 648000, while the sum is 43.

The square root of 256338655 is about 16010.5794710872. The cubic root of 256338655 is about 635.2402876764.

The spelling of 256338655 in words is "two hundred fifty-six million, three hundred thirty-eight thousand, six hundred fifty-five".