68388904321 has 2 divisors, whose sum is σ = 68388904322. Its totient is φ = 68388904320.

The previous prime is 68388904273. The next prime is 68388904327. The reversal of 68388904321 is 12340988386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67815972225 + 572932096 = 260415^2 + 23936^2 .

It is a cyclic number.

It is not a de Polignac number, because 68388904321 - 2¹¹ = 68388902273 is a prime.

It is not a weakly prime, because it can be changed into another prime (68388904327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34194452160 + 34194452161.

It is an arithmetic number, because the mean of its divisors is an integer number (34194452161).

Almost surely, 2^68388904321 is an apocalyptic number.

It is an amenable number.

68388904321 is a deficient number, since it is larger than the sum of its proper divisors (1).

68388904321 is an equidigital number, since it uses as much as digits as its factorization.

68388904321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1990656, while the sum is 52.

The spelling of 68388904321 in words is "sixty-eight billion, three hundred eighty-eight million, nine hundred four thousand, three hundred twenty-one".