4e-10 = -6
4E10 typically refers to a numerical representation in scientific notation, meaning 4 x 10^10. This indicates the number 40,000,000,000. It is often used in scientific and engineering contexts to express very large numbers more compactly.
The E on a calculator means "times ten to the power of." 4E10 means 4 times 10 to the power of 10.