Hex #66954d or rgb(102,149,77) in RGB space is the tint of grass green. It has hue angle of 99.17 degrees, value = 58 and saturation = 48. #66954d can be obtained by mixing 4 colors: 1 drop of red, 4 drops of green, 3 drops of white, 2 drops of black.
Nearest safe hex - #669966. Below you can see the block with #66954d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66954d to the mixer and play with it.