13731317778559 has 2 divisors, whose sum is σ = 13731317778560. Its totient is φ = 13731317778558.

The previous prime is 13731317778533. The next prime is 13731317778569. The reversal of 13731317778559 is 95587771313731.

13731317778559 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 is a cyclic number.

It is not a de Polignac number, because 13731317778559 - 2²⁵ = 13731284224127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13731317778494 and 13731317778503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13731317778569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6865658889279 + 6865658889280.

It is an arithmetic number, because the mean of its divisors is an integer number (6865658889280).

Almost surely, 2^{13731317778559} is an apocalyptic number.

13731317778559 is a deficient number, since it is larger than the sum of its proper divisors (1).

13731317778559 is an equidigital number, since it uses as much as digits as its factorization.

13731317778559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116688600, while the sum is 67.

The spelling of 13731317778559 in words is "thirteen trillion, seven hundred thirty-one billion, three hundred seventeen million, seven hundred seventy-eight thousand, five hundred fifty-nine".