Hex #66a15e or rgb(102,161,94) in RGB space is the tint of green. It has hue angle of 112.84 degrees, value = 63 and saturation = 42. #66a15e can be obtained by mixing 4 colors: 3 drops of yellow, 4 drops of blue, 2 drops of green, 1 drop of white.
Nearest safe hex - #669966. Below you can see the block with #66a15e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66a15e to the mixer and play with it.