Hex #66b04d or rgb(102,176,77) in RGB space is the tint of grass green. It has hue angle of 104.85 degrees, value = 69 and saturation = 56. #66b04d can be obtained by mixing 4 colors: 4 drops of yellow, 3 drops of blue, 1 drop of cyan, 2 drops of green.
Nearest safe hex - #669966. Below you can see the block with #66b04d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66b04d to the mixer and play with it.