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1x10153 times 999999999 is 999999999x10153. Normalizing that, you get 9.999999999x10161.
It equals 285
If you mean: -4+3+2s = 15 then s = 8
That sum is 84. Since it's only one number, its mean is also 84. If those numbers were simply listed, without being added, then their mean would be 16.8 .
This looks like the commonly used shortcut for scientific notation. 1e20 or 1e+20 is the same as 1 x 1020.