1E17

1E17 is the scientific notation for the numeric value 1×10^17. In decimal form, this equals 100,000,000,000,000,000. The number lies between 10^16 (ten quadrillion) and 10^18 (one quintillion) on the short scale commonly used in English-speaking countries. It is a convenient magnitude for expressing very large counts, distances, or quantities in science and engineering.

In everyday notation, 1E17 is often written as 1e17, especially in programming and data contexts. When used as a floating-point literal, the exact representation can depend on the data type: floating-point formats may not store the value exactly due to finite precision, whereas an integer type with sufficient width (for example a 64-bit signed integer) can represent 1×10^17 exactly.

Common contexts for encountering 1E17 include large data sizes and astronomical scales. For example, 1e17 bytes corresponds to about 100 petabytes, a range encountered in discussions of big data storage. In terms of length, 1e17 meters is roughly 3.2 parsecs, a unit used in astronomy to describe distances to nearby stars.

Overall, 1E17 serves as a concise way to express a large, precise quantity in scientific and computational work, bridging numerical convenience with real-world magnitudes.