68239752217 has 16 divisors (see below), whose sum is σ = 84008171520. Its totient is φ = 53978530752.

The previous prime is 68239752193. The next prime is 68239752247. The reversal of 68239752217 is 71225793286.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 68239752217 - 2²³ = 68231363609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68239752247) 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 in 15 ways as a sum of consecutive naturals, for example, 285384 + ... + 466822.

It is an arithmetic number, because the mean of its divisors is an integer number (5250510720).

Almost surely, 2^68239752217 is an apocalyptic number.

It is an amenable number.

68239752217 is a deficient number, since it is larger than the sum of its proper divisors (15768419303).

68239752217 is a wasteful number, since it uses less digits than its factorization.

68239752217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185592.

The product of its digits is 2540160, while the sum is 52.

The spelling of 68239752217 in words is "sixty-eight billion, two hundred thirty-nine million, seven hundred fifty-two thousand, two hundred seventeen".