his calculator is correct, is 6E+10, "E" is just the Engineering format, and it uses a capital E instead of the base 10, but is basically the same thing, 6x10¹⁰ in scientific notation is the same thing as 6E10 or 6E+10 in Engineering notation, just different formatting,
and of course it means 6 followed by 10 zeros, 60,000,000,000.