Lisp can count to how high?

[1]> (format nil "~r" 1606938044258990275541962092)
"one octillion, six hundred and six septillion, nine hundred and
thirty-eight sextillion, forty-four quintillion, two hundred and
fifty-eight quadrillion, nine hundred and ninety trillion, two hundred
and seventy-five billion, five hundred and forty-one million, nine
hundred and sixty-two thousand, ninety-two"