Hex #668e66 or rgb(102,142,102) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 56 and saturation = 28. #668e66 can be obtained by mixing 4 colors: 1 drop of yellow, 1 drop of red, 2 drops of cyan, 1 drop of black.
Nearest safe hex - #669966. Below you can see the block with #668e66 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #668e66 to the mixer and play with it.