Hex #66b84d or rgb(102,184,77) in RGB space is the tint of grass green. It has hue angle of 105.98 degrees, value = 72 and saturation = 58. #66b84d can be obtained by mixing 4 colors: 4 drops of yellow, 3 drops of cyan, 1 drop of green, 2 drops of black.
Nearest safe hex - #66cc66. Below you can see the block with #66b84d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66b84d to the mixer and play with it.