Hex #55889c or rgb(85,136,156) in RGB space is the tint of bluish cian. It has hue angle of 196.90 degrees, value = 61 and saturation = 46. #55889c can be obtained by mixing 4 colors: 1 drop of blue, 1 drop of cyan, 2 drops of white, 2 drops of black.
Nearest safe hex - #669999. Below you can see the block with #55889c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55889c to the mixer and play with it.