Note that the 16th digit will not be reliable stored in SAS numbers.  See Numerical Precision discussion in the documentation: https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.5/lepg/p0dv87zb3bnse6n1mqo360be70qr.htm   To control how values are PRINTED in SAS you can attach a FORMAT to the variable.  The EXPORT produces just uses a normal data step with PUT statement to write the CSV file.  So whatever format was attached to the variable will be used.   16 digits total?  You might try using BEST17. (leaving one space for the decimal point). Or perhaps BEST18. if you have any negative values.   16 to the right of the decimal point?  How many to the left of the decimal point?  Use 18.16 to write 16 to the right of the decimal point, a decimal point, and one digit to the left.   Or something else?         ... View more