Hex #66a044 or rgb(102,160,68) in RGB space is the tint of grass green. It has hue angle of 97.83 degrees, value = 63 and saturation = 58. #66a044 can be obtained by mixing 4 colors: 2 drops of yellow, 5 drops of green, 4 drops of white, 4 drops of black.
Nearest safe hex - #669933. Below you can see the block with #66a044 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66a044 to the mixer and play with it.