Fatto generale: 61898 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 61898 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 61898 is an uninteresting number.
Data storica: June 20th is the day in 1963 that the so-called "red telephone" is established between the Soviet Union and the United States following the Cuban Missile Crisis.