256517274110513 has 4 divisors (see below), whose sum is σ = 276249372119028. Its totient is φ = 236785176102000.

The previous prime is 256517274110497. The next prime is 256517274110549. The reversal of 256517274110513 is 315011472715652.

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 71752301072929 + 184764973037584 = 8470673^2 + 13592828^2 .

It is a cyclic number.

It is not a de Polignac number, because 256517274110513 - 2⁴ = 256517274110497 is a prime.

It is a super-2 number, since 2×256517274110513² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256517274110593) 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, 9866049004238 + ... + 9866049004263.

It is an arithmetic number, because the mean of its divisors is an integer number (69062343029757).

Almost surely, 2^{256517274110513} is an apocalyptic number.

It is an amenable number.

256517274110513 is a deficient number, since it is larger than the sum of its proper divisors (19732098008515).

256517274110513 is a wasteful number, since it uses less digits than its factorization.

256517274110513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19732098008514.

The product of its (nonzero) digits is 1764000, while the sum is 50.

The spelling of 256517274110513 in words is "two hundred fifty-six trillion, five hundred seventeen billion, two hundred seventy-four million, one hundred ten thousand, five hundred thirteen".