12513881257 has 2 divisors, whose sum is σ = 12513881258. Its totient is φ = 12513881256.

The previous prime is 12513881207. The next prime is 12513881267. The reversal of 12513881257 is 75218831521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10841807376 + 1672073881 = 104124^2 + 40891^2 .

It is a cyclic number.

It is not a de Polignac number, because 12513881257 - 2¹⁵ = 12513848489 is a prime.

It is a super-2 number, since 2×12513881257² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12513881207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6256940628 + 6256940629.

It is an arithmetic number, because the mean of its divisors is an integer number (6256940629).

Almost surely, 2^12513881257 is an apocalyptic number.

It is an amenable number.

12513881257 is a deficient number, since it is larger than the sum of its proper divisors (1).

12513881257 is an equidigital number, since it uses as much as digits as its factorization.

12513881257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134400, while the sum is 43.

The spelling of 12513881257 in words is "twelve billion, five hundred thirteen million, eight hundred eighty-one thousand, two hundred fifty-seven".