12866639959 has 4 divisors (see below), whose sum is σ = 13140398304. Its totient is φ = 12592881616.

The previous prime is 12866639957. The next prime is 12866639969. The reversal of 12866639959 is 95993666821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12866639959 - 2¹ = 12866639957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12866639959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12866639953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136879102 + ... + 136879195.

It is an arithmetic number, because the mean of its divisors is an integer number (3285099576).

Almost surely, 2^12866639959 is an apocalyptic number.

12866639959 is a deficient number, since it is larger than the sum of its proper divisors (273758345).

12866639959 is an equidigital number, since it uses as much as digits as its factorization.

12866639959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273758344.

The product of its digits is 37791360, while the sum is 64.

The spelling of 12866639959 in words is "twelve billion, eight hundred sixty-six million, six hundred thirty-nine thousand, nine hundred fifty-nine".