Hex #558cb0 or rgb(85,140,176) in RGB space is the tint of blue. It has hue angle of 203.74 degrees, value = 69 and saturation = 52. #558cb0 can be obtained by mixing 4 colors: 5 drops of blue, 2 drops of cyan, 5 drops of white, 3 drops of black.
Nearest safe hex - #669999. Below you can see the block with #558cb0 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #558cb0 to the mixer and play with it.