The "E" means "times 10 to the power of". So in this case, your example would mean: 1.0 x 10^15.Source(s): Chemistry Teacher
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5555555555555555555555555 is the answerSource(s): poopy land
your calculator is showing what the exponent is on a x 10^x
ie 1E15 is 1×10^15 or 2.5E7 is 2.5×10^7.
1.0 times 10 to the 15 power
1×10^15, eg 1 followed by 15 zeroes.