2^{15}
= 32768 and the sum of its digits is 3 + 2 + 7 + 6 + 8 =
26.

What is the sum of the digits of the number 2^{1000}?

Solution

Given the Large Number
Arithmetic functions, in some cell in Excel (I used Cell S28) enter the function =LargePower(2,1000). Then, to compute the sum of the individual digits
in the result, use the array formula
=SUM(--MID(S28,ROW(INDIRECT("1:"&LEN(S28))),1)) To enter an array
formula complete data entry with the CTRL+SHIFT+ENTER combination rather
than just the ENTER or TAB key. If done correctly, Excel will show
the formula wrapped between curly brackets { and }

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