Up to 19
Displays a value as a currency amount, with a currency symbol and thousands separator if specified in the data type’s format.
The currency value can be in the range [-99,999,999,999,999.99999 to 99,999,999,999,999.99999]. The decimal point is implied in the number, but not actually stored. For display purposes, currency values are limited to 14 digits to the left of the decimal and 5 digits to the right.