Hex #1a5f66 or rgb(26,95,102) in RGB space is the tint of cyan. It has hue angle of 185.53 degrees, value = 40 and saturation = 75. #1a5f66 can be obtained by mixing 3 colors: 1 drop of red, 4 drops of cyan, 5 drops of black.
Nearest safe hex - #336666. Below you can see the block with #1a5f66 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #1a5f66 to the mixer and play with it.