Hex #558fbd or rgb(85,143,189) in RGB space is the tint of blue. It has hue angle of 206.54 degrees, value = 74 and saturation = 55. #558fbd can be obtained by mixing 4 colors: 4 drops of blue, 1 drop of cyan, 3 drops of white, 1 drop of black.
Nearest safe hex - #6699cc. Below you can see the block with #558fbd color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #558fbd to the mixer and play with it.