68016533209 has 2 divisors, whose sum is σ = 68016533210. Its totient is φ = 68016533208.

The previous prime is 68016533191. The next prime is 68016533219. The reversal of 68016533209 is 90233561086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59929488025 + 8087045184 = 244805^2 + 89928^2 .

It is a cyclic number.

It is not a de Polignac number, because 68016533209 - 2⁹ = 68016532697 is a prime.

It is not a weakly prime, because it can be changed into another prime (68016533219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34008266604 + 34008266605.

It is an arithmetic number, because the mean of its divisors is an integer number (34008266605).

Almost surely, 2^68016533209 is an apocalyptic number.

It is an amenable number.

68016533209 is a deficient number, since it is larger than the sum of its proper divisors (1).

68016533209 is an equidigital number, since it uses as much as digits as its factorization.

68016533209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 68016533209 in words is "sixty-eight billion, sixteen million, five hundred thirty-three thousand, two hundred nine".