I'd like to know, who in the One Piece world has the max bounty declared against them till date? Note that the bounty amount has to be mentioned in either anime or manga or in the movies. I am assuming it is Katakuri? But I'm not sure.
The current highest active bounty is that of Charlotte Katakuri, one of the Three Sweet Commanders of Yonko Big Mom with a bounty of 1,057,000,000.
Taken from One Piece Wikia. One Piece Manga — Vol. 86 Chapter 860 (p. 14) is given as reference.