100000000000000000

100000000000000000 is the decimal numeral representing the integer 10^17. In the standard short-scale naming used in most English-language contexts, it is called one hundred quadrillion. In scientific notation it is written as 1 × 10^17. The number has 18 digits: a 1 followed by 17 zeros.

Mathematically, 10^17 factors as 2^17 × 5^17, so the value is even and composite; it is not a prime. In computing, it fits easily within a 64-bit signed integer, whose maximum is about 9.22 × 10^18. However, in IEEE 754 double-precision floating point format, 1 × 10^17 cannot be represented exactly, though it can be stored with some rounding.

In practical terms, 10^17 is a useful benchmark for illustrating very large magnitudes. For example, distances in astronomy can span powers of ten, and 1 × 10^17 meters is roughly 3.24 parsecs or about 10.6 light-years, placing it in the realm of nearby stars. Global economic figures—such as gross world product—tend to be on the order of 10^14 dollars, making 10^17 about a thousand times larger.

Naming conventions for such large numbers vary by culture and historical system. In the English short scale, 10^15 is quadrillion and 10^18 is quintillion, so 10^17 is commonly described as hundred quadrillion. Some European languages use the long scale, where the corresponding term differs. The magnitude remains the same, even as terminology shifts.