256081057 has 8 divisors (see below), whose sum is σ = 268329600. Its totient is φ = 243925440.

The previous prime is 256081043. The next prime is 256081061. The reversal of 256081057 is 750180652.

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 256081057 - 2¹¹ = 256079009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256081037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17557 + ... + 28642.

It is an arithmetic number, because the mean of its divisors is an integer number (33541200).

Almost surely, 2^256081057 is an apocalyptic number.

It is an amenable number.

256081057 is a deficient number, since it is larger than the sum of its proper divisors (12248543).

256081057 is a wasteful number, since it uses less digits than its factorization.

256081057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46463.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 256081057 is about 16002.5328307740. The cubic root of 256081057 is about 635.0274293233.

The spelling of 256081057 in words is "two hundred fifty-six million, eighty-one thousand, fifty-seven".