The unit digit in the power of 9 can be found by, 91=9→ unit digit is 9 92=81→ so, unit digit is 1 93=729→ unit digit is 9 94=6561→ unit digit is 1 So, from the above sequence, if follows that 9 power, if even the unit digit will be 1. and if 9 power, is odd unit digit will be 9 As per the question, 26591749110016 The answer of unit digit will be 1 .