Hex #558eab or rgb(85,142,171) in RGB space is the tint of bluish cian. It has hue angle of 200.23 degrees, value = 67 and saturation = 50. #558eab can be obtained by mixing 4 colors: 1 drop of yellow, 1 drop of magenta, 2 drops of blue, 2 drops of cyan.
Nearest safe hex - #669999. Below you can see the block with #558eab color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #558eab to the mixer and play with it.