12777805844 has 12 divisors (see below), whose sum is σ = 22630572384. Its totient is φ = 6311928024.

The previous prime is 12777805813. The next prime is 12777805849. The reversal of 12777805844 is 44850877721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12777805849) 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, 19243352 + ... + 19244015.

It is an arithmetic number, because the mean of its divisors is an integer number (1885881032).

Almost surely, 2^12777805844 is an apocalyptic number.

It is an amenable number.

12777805844 is a deficient number, since it is larger than the sum of its proper divisors (9852766540).

12777805844 is a wasteful number, since it uses less digits than its factorization.

12777805844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38487454 (or 38487452 counting only the distinct ones).

The product of its (nonzero) digits is 3512320, while the sum is 53.

The spelling of 12777805844 in words is "twelve billion, seven hundred seventy-seven million, eight hundred five thousand, eight hundred forty-four".