12679684517 has 4 divisors (see below), whose sum is σ = 12700169280. Its totient is φ = 12659199756.

The previous prime is 12679684463. The next prime is 12679684519. The reversal of 12679684517 is 71548697621.

It is a happy number.

12679684517 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71548697621 = 10589 ⋅6756889.

It is a cyclic number.

It is not a de Polignac number, because 12679684517 - 2¹⁸ = 12679422373 is a prime.

It is a super-3 number, since 3×12679684517³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12679684519) 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, 10241453 + ... + 10242690.

It is an arithmetic number, because the mean of its divisors is an integer number (3175042320).

Almost surely, 2^12679684517 is an apocalyptic number.

It is an amenable number.

12679684517 is a deficient number, since it is larger than the sum of its proper divisors (20484763).

12679684517 is an equidigital number, since it uses as much as digits as its factorization.

12679684517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20484762.

The product of its digits is 5080320, while the sum is 56.

The spelling of 12679684517 in words is "twelve billion, six hundred seventy-nine million, six hundred eighty-four thousand, five hundred seventeen".