Hex #558895 or rgb(85,136,149) in RGB space is the tint of bluish cian. It has hue angle of 192.19 degrees, value = 58 and saturation = 43. #558895 can be obtained by mixing 4 colors: 1 drop of yellow, 3 drops of red, 3 drops of blue, 5 drops of cyan.
Nearest safe hex - #669999. Below you can see the block with #558895 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #558895 to the mixer and play with it.