68668709 has 2 divisors, whose sum is σ = 68668710. Its totient is φ = 68668708.

The previous prime is 68668697. The next prime is 68668711. The reversal of 68668709 is 90786686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59243809 + 9424900 = 7697^2 + 3070^2 .

It is a cyclic number.

It is not a de Polignac number, because 68668709 - 2²⁴ = 51891493 is a prime.

Together with 68668711, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68668799) 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, 34334354 + 34334355.

It is an arithmetic number, because the mean of its divisors is an integer number (34334355).

Almost surely, 2^68668709 is an apocalyptic number.

It is an amenable number.

68668709 is a deficient number, since it is larger than the sum of its proper divisors (1).

68668709 is an equidigital number, since it uses as much as digits as its factorization.

68668709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 68668709 is about 8286.6584942303. The cubic root of 68668709 is about 409.4991087218.

The spelling of 68668709 in words is "sixty-eight million, six hundred sixty-eight thousand, seven hundred nine".