68381812608209 has 2 divisors, whose sum is σ = 68381812608210. Its totient is φ = 68381812608208.

The previous prime is 68381812608163. The next prime is 68381812608233. The reversal of 68381812608209 is 90280621818386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64145234301184 + 4236578307025 = 8009072^2 + 2058295^2 .

It is a cyclic number.

It is not a de Polignac number, because 68381812608209 - 2¹² = 68381812604113 is a prime.

It is a super-2 number, since 2×68381812608209² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68381812908209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34190906304104 + 34190906304105.

It is an arithmetic number, because the mean of its divisors is an integer number (34190906304105).

Almost surely, 2^{68381812608209} is an apocalyptic number.

It is an amenable number.

68381812608209 is a deficient number, since it is larger than the sum of its proper divisors (1).

68381812608209 is an equidigital number, since it uses as much as digits as its factorization.

68381812608209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15925248, while the sum is 62.

The spelling of 68381812608209 in words is "sixty-eight trillion, three hundred eighty-one billion, eight hundred twelve million, six hundred eight thousand, two hundred nine".