Hex #553387 or rgb(85,51,135) in RGB space is the tint of purple. It has hue angle of 264.29 degrees, value = 53 and saturation = 62. #553387 can be obtained by mixing 4 colors: 3 drops of magenta, 5 drops of blue, 1 drop of white, 3 drops of black.
Nearest safe hex - #663399. Below you can see the block with #553387 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #553387 to the mixer and play with it.