Hex #556d84 or rgb(85,109,132) in RGB space is the tint of blue. It has hue angle of 209.36 degrees, value = 52 and saturation = 36. #556d84 can be obtained by mixing 4 colors: 1 drop of magenta, 2 drops of cyan, 2 drops of white, 4 drops of black.
Nearest safe hex - #666699. Below you can see the block with #556d84 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556d84 to the mixer and play with it.