12768744637909 has 4 divisors (see below), whose sum is σ = 13750955763916. Its totient is φ = 11786533511904.

The previous prime is 12768744637877. The next prime is 12768744637973. The reversal of 12768744637909 is 90973644786721.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4888092075409 + 7880652562500 = 2210903^2 + 2807250^2 .

It is a cyclic number.

It is not a de Polignac number, because 12768744637909 - 2⁵ = 12768744637877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12768744637009) 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, 491105562984 + ... + 491105563009.

It is an arithmetic number, because the mean of its divisors is an integer number (3437738940979).

Almost surely, 2^{12768744637909} is an apocalyptic number.

It is an amenable number.

12768744637909 is a deficient number, since it is larger than the sum of its proper divisors (982211126007).

12768744637909 is an equidigital number, since it uses as much as digits as its factorization.

12768744637909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982211126006.

The product of its (nonzero) digits is 768144384, while the sum is 73.

The spelling of 12768744637909 in words is "twelve trillion, seven hundred sixty-eight billion, seven hundred forty-four million, six hundred thirty-seven thousand, nine hundred nine".