segue sugestão
library(Rmpfr)
mpfr(500^(-10), precBits = 255) - mpfr(1, precBits = 255)
# 1 'mpfr' number of precision 255 bits
# [1]
-0.999999999999999999999999998975999999999999914663505297831951000646311908486498
## caracteristica numerica da maquina
.Machine
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