256517345607130 has 16 divisors (see below), whose sum is σ = 461738248047720. Its totient is φ = 102605376919552.

The previous prime is 256517345607113. The next prime is 256517345607137. The reversal of 256517345607130 is 31706543715652.

It can be written as a sum of positive squares in 4 ways, for example, as 174743467969249 + 81773877637881 = 13219057^2 + 9042891^2 .

It is a super-2 number, since 2×256517345607130² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256517345607137) 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, 194475259 + ... + 195789838.

Almost surely, 2^{256517345607130} is an apocalyptic number.

256517345607130 is a deficient number, since it is larger than the sum of its proper divisors (205220902440590).

256517345607130 is a wasteful number, since it uses less digits than its factorization.

256517345607130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390330833.

The product of its (nonzero) digits is 15876000, while the sum is 55.

The spelling of 256517345607130 in words is "two hundred fifty-six trillion, five hundred seventeen billion, three hundred forty-five million, six hundred seven thousand, one hundred thirty".