Double the Last Number

[Earthling]

_ 2,658,455,991,569,831,745,807,614,120,560,689,152


+ 2,658,455,991,569,831,745,807,614,120,560,689,152


----------------------------------------------------


= 5 316 911 983 139 663 491 615 228 241 121 378 304


That's 5 undecillion, three hundred and sixteen decillion, nine hundred and eleven nonillion, nine hundred and eighty-three octillion, one hundred and thirty-nine septillion, six hundred and sixty-three sextillion, four hundred and ninety-one quintillion, six hundred and fifteen quadrillion, two hundred and twenty-eight trillion, two hundred and forty-one billion, one hundred and twenty one million, three hundred and seventy-eight thousand, three hundred and four.

Or 2¹¹². Edit three days later: Mustard! It's actually 2¹²².

For reference, that's about 500,000 times smaller than the mass of the galaxy in kilograms.