256629497513 has 4 divisors (see below), whose sum is σ = 257239069188. Its totient is φ = 256019925840.

The previous prime is 256629497471. The next prime is 256629497539. The reversal of 256629497513 is 315794926652.

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 15433589824 + 241195907689 = 124232^2 + 491117^2 .

It is a cyclic number.

It is not a de Polignac number, because 256629497513 - 2¹⁶ = 256629431977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256629491513) 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, 304785206 + ... + 304786047.

It is an arithmetic number, because the mean of its divisors is an integer number (64309767297).

Almost surely, 2^256629497513 is an apocalyptic number.

It is an amenable number.

256629497513 is a deficient number, since it is larger than the sum of its proper divisors (609571675).

256629497513 is an equidigital number, since it uses as much as digits as its factorization.

256629497513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609571674.

The product of its digits is 24494400, while the sum is 59.

The spelling of 256629497513 in words is "two hundred fifty-six billion, six hundred twenty-nine million, four hundred ninety-seven thousand, five hundred thirteen".