The notation "1.78E12" is a way to represent numbers in scientific notation. In this case, "E" stands for "times ten raised to the power of," so "1.78E12" means:
\[ 1.78 \times 10^{12} \]
This means that the number is 1.78 multiplied by 10 raised to the 12th power.
Calculating this gives:
\[ 1.78 \times 10^{12} = 1.78 \times 1,000,000,000,000 = 1,780,000,000,000 \]
So, Charlee's calculator is displaying a value of 1,780,000,000,000, which is one trillion, seven hundred eighty billion.