Fatto matematico: 6745 is the maximum value of n so that there exist 4 denominations of stamps so that every postage from 1 to n can be paid for with at most 25 stamps.
Trivia: 6745 is a boring number.
Data storica: June 19th is the day in 1964 that the Civil Rights Act of 1964 is approved after surviving an 83-day filibuster in the United States Senate.