Hex #66b050 or rgb(102,176,80) in RGB space is the tint of grass green. It has hue angle of 106.25 degrees, value = 69 and saturation = 55. #66b050 can be obtained by mixing 4 colors: 4 drops of yellow, 4 drops of blue, 5 drops of green, 2 drops of white.
Nearest safe hex - #669966. Below you can see the block with #66b050 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66b050 to the mixer and play with it.