Arithmetic (via S4 classes and methods) for arbitrary precision
floating point numbers, including transcendental ("special")
functions. To this end, Rmpfr interfaces to the LGPL'ed MPFR (Multiple
Precision Floating-Point Reliable) Library which itself is based
on the GMP (GNU Multiple Precision) Library.

WWW: https://cran.r-project.org/web/packages/Rmpfr/