12688745513 has 4 divisors (see below), whose sum is σ = 12725103300. Its totient is φ = 12652387728.

The previous prime is 12688745507. The next prime is 12688745519. The reversal of 12688745513 is 31554788621.

12688745513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31554788621 = 113 ⋅279245917.

It is an interprime number because it is at equal distance from previous prime (12688745507) and next prime (12688745519).

It can be written as a sum of positive squares in 2 ways, for example, as 4347028624 + 8341716889 = 65932^2 + 91333^2 .

It is a cyclic number.

It is not a de Polignac number, because 12688745513 - 2¹⁶ = 12688679977 is a prime.

It is a super-2 number, since 2×12688745513² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12688745519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18178370 + ... + 18179067.

It is an arithmetic number, because the mean of its divisors is an integer number (3181275825).

Almost surely, 2^12688745513 is an apocalyptic number.

It is an amenable number.

12688745513 is a deficient number, since it is larger than the sum of its proper divisors (36357787).

12688745513 is an equidigital number, since it uses as much as digits as its factorization.

12688745513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36357786.

The product of its digits is 1612800, while the sum is 50.

The spelling of 12688745513 in words is "twelve billion, six hundred eighty-eight million, seven hundred forty-five thousand, five hundred thirteen".