Hex #663f72 or rgb(102,63,114) in RGB space is the tint of purple magenta. It has hue angle of 285.88 degrees, value = 45 and saturation = 45. #663f72 can be obtained by mixing 4 colors: 2 drops of red, 4 drops of magenta, 4 drops of cyan, 5 drops of black.
Nearest safe hex - #663366. Below you can see the block with #663f72 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #663f72 to the mixer and play with it.