Hex #669e66 or rgb(102,158,102) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 62 and saturation = 35. #669e66 can be obtained by mixing 4 colors: 4 drops of red, 4 drops of cyan, 5 drops of green, 2 drops of white.
Nearest safe hex - #669966. Below you can see the block with #669e66 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #669e66 to the mixer and play with it.