Hex #668a66 or rgb(102,138,102) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 54 and saturation = 26. #668a66 can be obtained by mixing 3 colors: 1 drop of green, 2 drops of white, 2 drops of black.
Nearest safe hex - #669966. Below you can see the block with #668a66 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #668a66 to the mixer and play with it.