256066403 has 4 divisors (see below), whose sum is σ = 256677960. Its totient is φ = 255454848.

The previous prime is 256066379. The next prime is 256066409. The reversal of 256066403 is 304660652.

256066403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256066403 - 2⁸ = 256066147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256066403.

It is not an unprimeable number, because it can be changed into a prime (256066409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305150 + ... + 305987.

It is an arithmetic number, because the mean of its divisors is an integer number (64169490).

Almost surely, 2^256066403 is an apocalyptic number.

256066403 is a deficient number, since it is larger than the sum of its proper divisors (611557).

256066403 is an equidigital number, since it uses as much as digits as its factorization.

256066403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611556.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 256066403 is about 16002.0749592045. The cubic root of 256066403 is about 635.0153161412.

The spelling of 256066403 in words is "two hundred fifty-six million, sixty-six thousand, four hundred three".