# Numeric Implementations ## Topics ### Operators [`static func * (Int128, Int128) -> Int128`](/documentation/Swift/Int128/*(_:_:)) Multiplies two values and produces their product. [`static func *= (inout Int128, Int128)`](/documentation/Swift/Int128/*=(_:_:)) Multiplies two values and stores the result in the left-hand-side variable. ### Initializers [`init?(exactly: T)`](/documentation/Swift/Int128/init(exactly:)-3o2o0) Creates a new instance from the given integer, if it can be represented exactly. ### Instance Properties [`var magnitude: Int128.Magnitude`](/documentation/Swift/Int128/magnitude-swift.property) The magnitude of this value. ### Type Aliases [`typealias Magnitude`](/documentation/Swift/Int128/Magnitude-swift.typealias) A type that can represent the absolute value of any possible value of the conforming type. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)