Hex #66bb5b or rgb(102,187,91) in RGB space is the tint of green. It has hue angle of 113.13 degrees, value = 73 and saturation = 51. #66bb5b can be obtained by mixing 4 colors: 4 drops of yellow, 2 drops of magenta, 4 drops of cyan, 5 drops of green.
Nearest safe hex - #66cc66. Below you can see the block with #66bb5b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66bb5b to the mixer and play with it.