68820604217 has 2 divisors, whose sum is σ = 68820604218. Its totient is φ = 68820604216.

The previous prime is 68820604187. The next prime is 68820604271. The reversal of 68820604217 is 71240602886.

Together with next prime (68820604271) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52913340841 + 15907263376 = 230029^2 + 126124^2 .

It is a cyclic number.

It is not a de Polignac number, because 68820604217 - 2¹⁰ = 68820603193 is a prime.

It is not a weakly prime, because it can be changed into another prime (38820604217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34410302108 + 34410302109.

It is an arithmetic number, because the mean of its divisors is an integer number (34410302109).

Almost surely, 2^68820604217 is an apocalyptic number.

It is an amenable number.

68820604217 is a deficient number, since it is larger than the sum of its proper divisors (1).

68820604217 is an equidigital number, since it uses as much as digits as its factorization.

68820604217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048, while the sum is 44.

The spelling of 68820604217 in words is "sixty-eight billion, eight hundred twenty million, six hundred four thousand, two hundred seventeen".