256872163 has 2 divisors, whose sum is σ = 256872164. Its totient is φ = 256872162.

The previous prime is 256872157. The next prime is 256872173. The reversal of 256872163 is 361278652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256872163 - 2⁵ = 256872131 is a prime.

It is not a weakly prime, because it can be changed into another prime (256872173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128436081 + 128436082.

It is an arithmetic number, because the mean of its divisors is an integer number (128436082).

Almost surely, 2^256872163 is an apocalyptic number.

256872163 is a deficient number, since it is larger than the sum of its proper divisors (1).

256872163 is an equidigital number, since it uses as much as digits as its factorization.

256872163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 256872163 is about 16027.2319194551. The cubic root of 256872163 is about 635.6806828632.

The spelling of 256872163 in words is "two hundred fifty-six million, eight hundred seventy-two thousand, one hundred sixty-three".