256065613 has 4 divisors (see below), whose sum is σ = 256884028. Its totient is φ = 255247200.

The previous prime is 256065581. The next prime is 256065637. The reversal of 256065613 is 316560652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 769129 + 255296484 = 877^2 + 15978^2 .

It is a cyclic number.

It is not a de Polignac number, because 256065613 - 2⁵ = 256065581 is a prime.

It is a super-2 number, since 2×256065613² = 131139196322131538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256065643) 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, 408738 + ... + 409363.

It is an arithmetic number, because the mean of its divisors is an integer number (64221007).

Almost surely, 2^256065613 is an apocalyptic number.

It is an amenable number.

256065613 is a deficient number, since it is larger than the sum of its proper divisors (818415).

256065613 is an equidigital number, since it uses as much as digits as its factorization.

256065613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818414.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 256065613 is about 16002.0502748867. The cubic root of 256065613 is about 635.0146631041.

The spelling of 256065613 in words is "two hundred fifty-six million, sixty-five thousand, six hundred thirteen".