256556411 has 8 divisors (see below), whose sum is σ = 275155920. Its totient is φ = 238466592.

The previous prime is 256556407. The next prime is 256556431. The reversal of 256556411 is 114655652.

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 256556411 - 2² = 256556407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256556431) by changing a digit.

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, 126380 + ... + 128393.

It is an arithmetic number, because the mean of its divisors is an integer number (34394490).

Almost surely, 2^256556411 is an apocalyptic number.

256556411 is a deficient number, since it is larger than the sum of its proper divisors (18599509).

256556411 is a wasteful number, since it uses less digits than its factorization.

256556411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254845.

The product of its digits is 36000, while the sum is 35.

The square root of 256556411 is about 16017.3784059689. The cubic root of 256556411 is about 635.4201125952.

The spelling of 256556411 in words is "two hundred fifty-six million, five hundred fifty-six thousand, four hundred eleven".