138068787582809 has 2 divisors, whose sum is σ = 138068787582810. Its totient is φ = 138068787582808.

The previous prime is 138068787582797. The next prime is 138068787582821. The reversal of 138068787582809 is 908285787860831.

It is a balanced prime because it is at equal distance from previous prime (138068787582797) and next prime (138068787582821).

It can be written as a sum of positive squares in only one way, i.e., 117817239553225 + 20251548029584 = 10854365^2 + 4500172^2 .

It is an emirp because it is prime and its reverse (908285787860831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138068787582809 - 2²⁰ = 138068786534233 is a prime.

It is not a weakly prime, because it can be changed into another prime (138068787582829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69034393791404 + 69034393791405.

It is an arithmetic number, because the mean of its divisors is an integer number (69034393791405).

Almost surely, 2^{138068787582809} is an apocalyptic number.

It is an amenable number.

138068787582809 is a deficient number, since it is larger than the sum of its proper divisors (1).

138068787582809 is an equidigital number, since it uses as much as digits as its factorization.

138068787582809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2601123840, while the sum is 80.

The spelling of 138068787582809 in words is "one hundred thirty-eight trillion, sixty-eight billion, seven hundred eighty-seven million, five hundred eighty-two thousand, eight hundred nine".