Hex #66b233 or rgb(102,178,51) in RGB space is the tint of olive. It has hue angle of 95.91 degrees, value = 70 and saturation = 71. #66b233 can be obtained by mixing 4 colors: 2 drops of yellow, 1 drop of cyan, 1 drop of green, 1 drop of black.
Nearest safe hex - #669933. Below you can see the block with #66b233 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66b233 to the mixer and play with it.