Two to the power of 19 just means 19 x 19 = 361
The power is how many times the number is multiplied by itself. e.g 19 to the power of 3= 19 x 19 x 19
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2^19 = 524 288
2^64 =1.8446744e+19
819 = 144115188075855872 The number in the units column is therefore 2.
2, 6, 12, 19, 21, 24. Suggestion: don't bet the farm.
19/5 = 19 1/2 19 1/2 = [(19 x 2) + 1] / 2 => [38+1] /2 39/2