Hex #669b66 or rgb(102,155,102) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 61 and saturation = 34. #669b66 can be obtained by mixing 4 colors: 1 drop of yellow, 3 drops of red, 4 drops of cyan, 2 drops of green.
Nearest safe hex - #669966. Below you can see the block with #669b66 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #669b66 to the mixer and play with it.