Hex #663f66 or rgb(102,63,102) in RGB space is the tint of magenta. It has hue angle of 300.00 degrees, value = 40 and saturation = 38. #663f66 can be obtained by mixing 4 colors: 3 drops of red, 3 drops of magenta, 4 drops of cyan, 5 drops of black.
Nearest safe hex - #663366. Below you can see the block with #663f66 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #663f66 to the mixer and play with it.