Hex #155972 or rgb(21,89,114) in RGB space is the tint of bluish cian. It has hue angle of 196.13 degrees, value = 45 and saturation = 82. #155972 can be obtained by mixing 4 colors: 1 drop of yellow, 5 drops of blue, 2 drops of cyan, 4 drops of black.
Nearest safe hex - #006666. Below you can see the block with #155972 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #155972 to the mixer and play with it.