Hex #669c66 or rgb(102,156,102) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 61 and saturation = 35. #669c66 can be obtained by mixing 3 colors: 3 drops of green, 4 drops of white, 3 drops of black.
Nearest safe hex - #669966. Below you can see the block with #669c66 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #669c66 to the mixer and play with it.