or num·ber crunch·er
a person or thing that performs a great many numerical calculations, as a financial analyst, statistician, computer, or computer program.
Origin of number-cruncher
First recorded in 1965–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
computing the large-scale processing of numerical data
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012