13817816212861 has 2 divisors, whose sum is σ = 13817816212862. Its totient is φ = 13817816212860.

The previous prime is 13817816212831. The next prime is 13817816212867. The reversal of 13817816212861 is 16821261871831.

13817816212861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12860070176836 + 957746036025 = 3586094^2 + 978645^2 .

It is a cyclic number.

It is not a de Polignac number, because 13817816212861 - 2¹⁵ = 13817816180093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13817816212867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6908908106430 + 6908908106431.

It is an arithmetic number, because the mean of its divisors is an integer number (6908908106431).

Almost surely, 2^{13817816212861} is an apocalyptic number.

It is an amenable number.

13817816212861 is a deficient number, since it is larger than the sum of its proper divisors (1).

13817816212861 is an equidigital number, since it uses as much as digits as its factorization.

13817816212861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1548288, while the sum is 55.

The spelling of 13817816212861 in words is "thirteen trillion, eight hundred seventeen billion, eight hundred sixteen million, two hundred twelve thousand, eight hundred sixty-one".