Hex #556f87 or rgb(85,111,135) in RGB space is the tint of blue. It has hue angle of 208.80 degrees, value = 53 and saturation = 37. #556f87 can be obtained by mixing 4 colors: 4 drops of red, 2 drops of blue, 5 drops of cyan, 1 drop of black.
Nearest safe hex - #666699. Below you can see the block with #556f87 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556f87 to the mixer and play with it.