12778937849 has 2 divisors, whose sum is σ = 12778937850. Its totient is φ = 12778937848.

The previous prime is 12778937833. The next prime is 12778937867. The reversal of 12778937849 is 94873987721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12021587449 + 757350400 = 109643^2 + 27520^2 .

It is an emirp because it is prime and its reverse (94873987721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12778937849 - 2⁴ = 12778937833 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12778930849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6389468924 + 6389468925.

It is an arithmetic number, because the mean of its divisors is an integer number (6389468925).

Almost surely, 2^12778937849 is an apocalyptic number.

It is an amenable number.

12778937849 is a deficient number, since it is larger than the sum of its proper divisors (1).

12778937849 is an equidigital number, since it uses as much as digits as its factorization.

12778937849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42674688, while the sum is 65.

The spelling of 12778937849 in words is "twelve billion, seven hundred seventy-eight million, nine hundred thirty-seven thousand, eight hundred forty-nine".