12679435609 has 3 divisors (see below), whose sum is σ = 12679548213. Its totient is φ = 12679323006.

The previous prime is 12679435603. The next prime is 12679435697. The reversal of 12679435609 is 90653497621.

It is a happy number.

The square root of 12679435609 is 112603.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90653497621 = 26209 ⋅3458869.

It is not a de Polignac number, because 12679435609 - 2¹⁷ = 12679304537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12679435603) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 56302 + ... + 168904.

It is an arithmetic number, because the mean of its divisors is an integer number (4226516071).

Almost surely, 2^12679435609 is an apocalyptic number.

12679435609 is the 112603-rd square number.

12679435609 is the 56302-nd centered octagonal number.

It is an amenable number.

12679435609 is a deficient number, since it is larger than the sum of its proper divisors (112604).

12679435609 is an frugal number, since it uses more digits than its factorization.

12679435609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225206 (or 112603 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 52.

The spelling of 12679435609 in words is "twelve billion, six hundred seventy-nine million, four hundred thirty-five thousand, six hundred nine".