68320541209 has 2 divisors, whose sum is σ = 68320541210. Its totient is φ = 68320541208.

The previous prime is 68320541203. The next prime is 68320541251. The reversal of 68320541209 is 90214502386.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60179449225 + 8141091984 = 245315^2 + 90228^2 .

It is a cyclic number.

It is not a de Polignac number, because 68320541209 - 2²¹ = 68318444057 is a prime.

It is not a weakly prime, because it can be changed into another prime (68320541203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34160270604 + 34160270605.

It is an arithmetic number, because the mean of its divisors is an integer number (34160270605).

Almost surely, 2^68320541209 is an apocalyptic number.

It is an amenable number.

68320541209 is a deficient number, since it is larger than the sum of its proper divisors (1).

68320541209 is an equidigital number, since it uses as much as digits as its factorization.

68320541209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 68320541209 in words is "sixty-eight billion, three hundred twenty million, five hundred forty-one thousand, two hundred nine".