256612235320313 has 4 divisors (see below), whose sum is σ = 256612959747828. Its totient is φ = 256611510892800.

The previous prime is 256612235320253. The next prime is 256612235320351. The reversal of 256612235320313 is 313023532216652.

It is a happy number.

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 1209390676729 + 255402844643584 = 1099723^2 + 15981328^2 .

It is a cyclic number.

It is not a de Polignac number, because 256612235320313 - 2¹⁰ = 256612235319289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256612235320393) 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, 361682156 + ... + 362390957.

It is an arithmetic number, because the mean of its divisors is an integer number (64153239936957).

Almost surely, 2^{256612235320313} is an apocalyptic number.

It is an amenable number.

256612235320313 is a deficient number, since it is larger than the sum of its proper divisors (724427515).

256612235320313 is an equidigital number, since it uses as much as digits as its factorization.

256612235320313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724427514.

The product of its (nonzero) digits is 1166400, while the sum is 44.

Adding to 256612235320313 its reverse (313023532216652), we get a palindrome (569635767536965).

The spelling of 256612235320313 in words is "two hundred fifty-six trillion, six hundred twelve billion, two hundred thirty-five million, three hundred twenty thousand, three hundred thirteen".