Jabba is correct in this instance. The number he is seeking is, in fact, unimaginable, much the same way that Lovecraft's "Color Out of Space" cannot be imagined or described. In other words, it does not exist. It goes without saying that this number is neither whole nor rational; it is perhaps axiomatic that it is not irrational or imaginary. No, no. It is, by definition, an unimaginable number.
Why? Because of what it portrays. It is a number which represents a finite amount but which can be made to act mathematically as if it were infinite. It is a number that allows Jabba to feign correction of error while clinging to fallacy. It exists and does not exist. It is limited and limitless. It is the Heisenberg number, knowable precisely either in definition or in size, but not both. It is the superposition of numbers, existing as both a quantifiable amount and as an incalculable infinity. This is the inverse Planck length; no number can be larger and no probability smaller.
It is Quantum Incarnate. I call it Bohr's Bane.