Java BigInteger.valueOf() is a static method in the Java BigInteger class that converts a Java long value into a BigInteger. This method is useful for converting primitive numeric values into arbitrary-precision integers for high-precision arithmetic. Introduced in Java 2004 with Java 5, valueOf() is commonly used in cryptographic algorithms, large-number calculations, and financial systems that require precision beyond the limits of primitive types.

https://docs.oracle.com/javase/8/docs/api/java/math/BigInteger.html