Hex #55185b or rgb(85,24,91) in RGB space is the tint of magenta. It has hue angle of 294.63 degrees, value = 36 and saturation = 74. #55185b can be obtained by mixing 4 colors: 2 drops of red, 3 drops of magenta, 5 drops of blue, 5 drops of black.
Nearest safe hex - #660066. Below you can see the block with #55185b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55185b to the mixer and play with it.