Hex #556fab or rgb(85,111,171) in RGB space is the tint of blue violet. It has hue angle of 221.86 degrees, value = 67 and saturation = 50. #556fab can be obtained by mixing 4 colors: 1 drop of yellow, 2 drops of magenta, 4 drops of blue, 2 drops of cyan.
Nearest safe hex - #666699. Below you can see the block with #556fab color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556fab to the mixer and play with it.