Hex #66ad1a or rgb(102,173,26) in RGB space is the tint of olive. It has hue angle of 88.98 degrees, value = 68 and saturation = 85. #66ad1a can be obtained by mixing 4 colors: 4 drops of yellow, 1 drop of cyan, 3 drops of green, 2 drops of black.
Nearest safe hex - #669933. Below you can see the block with #66ad1a color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66ad1a to the mixer and play with it.