12790178809 has 2 divisors, whose sum is σ = 12790178810. Its totient is φ = 12790178808.

The previous prime is 12790178749. The next prime is 12790178857. The reversal of 12790178809 is 90887109721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11805474409 + 984704400 = 108653^2 + 31380^2 .

It is an emirp because it is prime and its reverse (90887109721) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12790178809 is a prime.

It is not a weakly prime, because it can be changed into another prime (12790178899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6395089404 + 6395089405.

It is an arithmetic number, because the mean of its divisors is an integer number (6395089405).

Almost surely, 2^12790178809 is an apocalyptic number.

It is an amenable number.

12790178809 is a deficient number, since it is larger than the sum of its proper divisors (1).

12790178809 is an equidigital number, since it uses as much as digits as its factorization.

12790178809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 52.

The spelling of 12790178809 in words is "twelve billion, seven hundred ninety million, one hundred seventy-eight thousand, eight hundred nine".