Hex #66ca4d or rgb(102,202,77) in RGB space is the tint of grass green. It has hue angle of 108.00 degrees, value = 79 and saturation = 62. #66ca4d can be obtained by mixing 4 colors: 4 drops of yellow, 3 drops of cyan, 2 drops of green, 1 drop of black.
Nearest safe hex - #66cc66. Below you can see the block with #66ca4d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66ca4d to the mixer and play with it.