Hex #669933 or rgb(102,153,51) in RGB space is the tint of olive. It has hue angle of 90.00 degrees, value = 60 and saturation = 67. #669933 can be obtained by mixing 4 colors: 2 drops of yellow, 3 drops of green, 2 drops of white, 3 drops of black.
Nearest safe hex - #669933. Below you can see the block with #669933 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #669933 to the mixer and play with it.