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1×10^15 is a large number commonly encountered in science and engineering. It equals 1,000,000,000,000,000 and is written in decimal scientific notation as 1×10^15. The decimal prefix for 10^15 is peta-, so quantities at this scale are described as petascale, for example a petabyte or a petaflop.

Examples include 1 petabyte (10^15 bytes) and 1 petaflop (10^15 floating-point operations per second). These terms are commonly used to describe data storage capacity and computing performance in modern information technology.

In terms of time and distance, 1×10^15 seconds is about 31.7 million years. For distance, 1×10^15 meters is roughly 0.11 light-years and about 1 trillion kilometers, illustrating how quickly astronomical or geophysical scales escalate when using such large numbers.

Economic usage varies by numbering systems. In the United States, 1×10^15 dollars equals one quadrillion dollars. In the traditional long scale used historically in parts of Europe, the same figure would be called one billiard dollars. The distinction reflects differences in naming conventions rather than in the numeric value.

Overall, 1×10^15 serves as a reference point for extremely large quantities across disciplines, and its SI-prefix representation (peta-) helps convey scale succinctly in scientific communication.