Hex #5b9b9e or rgb(91,155,158) in RGB space is the tint of cyan. It has hue angle of 182.69 degrees, value = 62 and saturation = 42. #5b9b9e can be obtained by mixing 4 colors: 4 drops of magenta, 5 drops of cyan, 4 drops of green, 1 drop of white.
Nearest safe hex - #669999. Below you can see the block with #5b9b9e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5b9b9e to the mixer and play with it.