How to save excel columns with long numbers into csv?

Question

Funny thing when I want to save Excel columns with long numbers like below, resulting csv contains converted numbers to scientific notation which is unusable. I want them to be save as text. Any trick to do that?

28160010390002003505456159  
12160010390002003505456156  
39160010390002003505456155  
39160010390002003505456155  

Answer 1

Append a TAB char (ASCII 9) at the end of a number.

Answer 2

put the number as a function like below: ="123456789123456789"