Hex #66da66 or rgb(102,218,102) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 85 and saturation = 53. #66da66 can be obtained by mixing 4 colors: 1 drop of yellow, 1 drop of cyan, 2 drops of green, 1 drop of white.
Nearest safe hex - #66cc66. Below you can see the block with #66da66 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66da66 to the mixer and play with it.