Hex #668c33 or rgb(102,140,51) in RGB space is the tint of olive. It has hue angle of 85.62 degrees, value = 55 and saturation = 64. #668c33 can be obtained by mixing 4 colors: 3 drops of red, 1 drop of cyan, 5 drops of green, 1 drop of white.
Nearest safe hex - #669933. Below you can see the block with #668c33 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #668c33 to the mixer and play with it.