ripple transaction max amount If I send a query

{"method":"sign","params":[{"secret":"shU9DWXZ1bhtaZRipiCedMUn1B2Gg","tx_json":{"Amount":9000000000,"Account":"rPa8RMPnEJxW4dpkJhnqj7GQYUB9PQ5gEW","Destination":"rH7k1edohG2XCBuTiB8RrMaKRgi2wNkXYg","DestinationTag":100008276,"TransactionType":"Payment"}}]}


The testnet Ripple server (https://s.altnet.rippletest.net:51234) give me

Unable to parse request: * Line 1, Column 90 '9000000000' exceeds the allowable range.


How can I send more than 9000 XRP at one transaction?
I don't know if this issue still a problem? But Sending the amount property as a string worked for me.