Hex #66b73c or rgb(102,183,60) in RGB space is the tint of grass green. It has hue angle of 99.51 degrees, value = 72 and saturation = 67. #66b73c can be obtained by mixing 4 colors: 3 drops of yellow, 2 drops of blue, 4 drops of green, 1 drop of white.
Nearest safe hex - #66cc33. Below you can see the block with #66b73c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66b73c to the mixer and play with it.