Hex #15605d or rgb(21,96,93) in RGB space is the tint of cyan. It has hue angle of 177.60 degrees, value = 38 and saturation = 78. #15605d can be obtained by mixing 4 colors: 5 drops of blue, 3 drops of green, 1 drop of white, 3 drops of black.
Nearest safe hex - #006666. Below you can see the block with #15605d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #15605d to the mixer and play with it.