Save Array Data to Playerprefs

I have this problem: I have a 3d Array and i want all the data it has to be saved. i have tried to use playerprefs with no success. If you know how i can do that please tell me down bellow.

My code:
// the Array i have
public int[,,] StatsArray = new int[3000,13,6];

and i tried to save it like this
PlayerPrefs.SetInt("Stats",44) = StatsArray[44, 2, 5] ;
but it gives me errors.
also instead of 44, 2, 5 i want to have valuables.
Thanks in advance