256544263 has 8 divisors (see below), whose sum is σ = 274274208. Its totient is φ = 239107584.

The previous prime is 256544261. The next prime is 256544287. The reversal of 256544263 is 362445652.

256544263 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256544263 - 2¹ = 256544261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256544261) 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, 71506 + ... + 75007.

It is an arithmetic number, because the mean of its divisors is an integer number (34284276).

Almost surely, 2^256544263 is an apocalyptic number.

256544263 is a deficient number, since it is larger than the sum of its proper divisors (17729945).

256544263 is a wasteful number, since it uses less digits than its factorization.

256544263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146633.

The product of its digits is 172800, while the sum is 37.

The square root of 256544263 is about 16016.9991883623. Note that the first 3 decimals coincide. The cubic root of 256544263 is about 635.4100833450.

The spelling of 256544263 in words is "two hundred fifty-six million, five hundred forty-four thousand, two hundred sixty-three".