256205013 has 8 divisors (see below), whose sum is σ = 344630208. Its totient is φ = 169291584.

The previous prime is 256205009. The next prime is 256205039. The reversal of 256205013 is 310502652.

256205013 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 256205013 - 2² = 256205009 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256205093) 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, 377545 + ... + 378222.

It is an arithmetic number, because the mean of its divisors is an integer number (43078776).

Almost surely, 2^256205013 is an apocalyptic number.

It is an amenable number.

256205013 is a deficient number, since it is larger than the sum of its proper divisors (88425195).

256205013 is a wasteful number, since it uses less digits than its factorization.

256205013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755883.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 256205013 is about 16006.4053740995. The cubic root of 256205013 is about 635.1298744419.

Adding to 256205013 its reverse (310502652), we get a palindrome (566707665).

The spelling of 256205013 in words is "two hundred fifty-six million, two hundred five thousand, thirteen".