Hex #55787b or rgb(85,120,123) in RGB space is the tint of cyan. It has hue angle of 184.74 degrees, value = 48 and saturation = 31. #55787b can be obtained by mixing 4 colors: 2 drops of yellow, 5 drops of blue, 1 drop of white, 1 drop of black.
Nearest safe hex - #666666. Below you can see the block with #55787b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55787b to the mixer and play with it.