12866978769 has 4 divisors (see below), whose sum is σ = 17155971696. Its totient is φ = 8577985844.

The previous prime is 12866978737. The next prime is 12866978779. The reversal of 12866978769 is 96787966821.

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.

It is a cyclic number.

It is not a de Polignac number, because 12866978769 - 2⁵ = 12866978737 is a prime.

It is a super-2 number, since 2×12866978769² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12866978779) 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, 2144496459 + ... + 2144496464.

It is an arithmetic number, because the mean of its divisors is an integer number (4288992924).

Almost surely, 2^12866978769 is an apocalyptic number.

It is an amenable number.

12866978769 is a deficient number, since it is larger than the sum of its proper divisors (4288992927).

12866978769 is an equidigital number, since it uses as much as digits as its factorization.

12866978769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4288992926.

The product of its digits is 109734912, while the sum is 69.

The spelling of 12866978769 in words is "twelve billion, eight hundred sixty-six million, nine hundred seventy-eight thousand, seven hundred sixty-nine".