Hex #55958e or rgb(85,149,142) in RGB space is the tint of cyan. It has hue angle of 173.44 degrees, value = 58 and saturation = 43. #55958e can be obtained by mixing 4 colors: 3 drops of blue, 2 drops of green, 3 drops of white, 1 drop of black.
Nearest safe hex - #669999. Below you can see the block with #55958e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55958e to the mixer and play with it.