It all depends on Oda's retarded fetish of meaning behind numbers. He likes this bs so casuals can call him Goda.
King will most likely have numbers that means something about him.
Right.
Well, King is a Pteranodon, whose fossils were first found, I think, in 1870. So him having 1.870.000.000 is possible.
Also, the Kanji for his Japanese name (Kasai no King) is comprised of 2 letters. The first is written in 4 strokes, the second in 6. So, him having something like 1.460.000.000 is also possible.
Japan's most famous conflagration took place in 1657 and killed over 100k people, so King having 1.657.000.000 is also probable.
This is what I can think of at the moment.