Hex #66aa33 or rgb(102,170,51) in RGB space is the tint of olive. It has hue angle of 94.29 degrees, value = 67 and saturation = 70. #66aa33 can be obtained by mixing 3 colors: 4 drops of yellow, 3 drops of blue, 3 drops of green.
Nearest safe hex - #669933. Below you can see the block with #66aa33 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66aa33 to the mixer and play with it.