222e16

222e16 is a numeric literal written in scientific notation. It denotes 222 × 10^16, which equals 2,220,000,000,000,000,000 (2.22 × 10^18). The expression is used in mathematics and computing to express large values succinctly.

In programming languages, 222e16 is typically parsed as a floating-point constant (for example as a double in C, C++, Java, JavaScript, and Python). Some contexts also allow 222e16 to be written as 2.22e18. The 'e' stands for exponent base 10, indicating the power of ten by which 222 is multiplied.

Precision and representation: when stored as a floating-point number, 2.22 × 10^18 cannot be represented exactly with a 64-bit double due to finite precision. Doubles have about 15–16 decimal digits of precision, and the gap between representable values near 2 × 10^18 is larger than 1. The exact integer 2,220,000,000,000,000,000 is representable in 64-bit integer form, but not as an exact double. For exact arithmetic, use integer types or arbitrary-precision arithmetic libraries.

Related topics include scientific notation, floating-point arithmetic, and integer literals in various programming languages.