Hex #663b91 or rgb(102,59,145) in RGB space is the tint of purple. It has hue angle of 270.00 degrees, value = 57 and saturation = 59. #663b91 can be obtained by mixing 4 colors: 2 drops of red, 2 drops of magenta, 5 drops of blue, 1 drop of cyan.
Nearest safe hex - #663399. Below you can see the block with #663b91 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #663b91 to the mixer and play with it.