Hex #66bb3c or rgb(102,187,60) in RGB space is the tint of grass green. It has hue angle of 100.16 degrees, value = 73 and saturation = 68. #66bb3c can be obtained by mixing 4 colors: 4 drops of yellow, 2 drops of blue, 1 drop of cyan, 3 drops of green.
Nearest safe hex - #66cc33. Below you can see the block with #66bb3c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66bb3c to the mixer and play with it.