Hex #551856 or rgb(85,24,86) in RGB space is the tint of magenta. It has hue angle of 299.03 degrees, value = 34 and saturation = 72. #551856 can be obtained by mixing 4 colors: 1 drop of red, 1 drop of magenta, 2 drops of blue, 2 drops of black.
Nearest safe hex - #660066. Below you can see the block with #551856 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #551856 to the mixer and play with it.