13366438991309 has 2 divisors, whose sum is σ = 13366438991310. Its totient is φ = 13366438991308.

The previous prime is 13366438991293. The next prime is 13366438991383. The reversal of 13366438991309 is 90319983466331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9818527703209 + 3547911288100 = 3133453^2 + 1883590^2 .

It is an emirp because it is prime and its reverse (90319983466331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13366438991309 - 2⁴ = 13366438991293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13366438993309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6683219495654 + 6683219495655.

It is an arithmetic number, because the mean of its divisors is an integer number (6683219495655).

Almost surely, 2^{13366438991309} is an apocalyptic number.

It is an amenable number.

13366438991309 is a deficient number, since it is larger than the sum of its proper divisors (1).

13366438991309 is an equidigital number, since it uses as much as digits as its factorization.

13366438991309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68024448, while the sum is 65.

The spelling of 13366438991309 in words is "thirteen trillion, three hundred sixty-six billion, four hundred thirty-eight million, nine hundred ninety-one thousand, three hundred nine".