05,501 & 05,544

[Zip]  The only 2 U.S. Postal Zip Codes starting with 055: Andover, Vermont 05501 and 05544. Coincidentally, the only 2 U.S. Postal Zip Codes starting with 00 are: Holtsville, New York, Vermont 00501 and 00544.

 

5,525

[Math.]  A pyramidal number (sum of all squares of integers from 1 to 25): 5525 = 12+22+…+242+252.

 

5,554

[Math.]  55543 = 171,323,771,464 = (1713+2377+1464)3.

 

5,555

[Phone]  The number to key in text messaging on telephone keypad for number 5.

 

5,556

[Measure]  The exact length (m, meters) of a marine league.

1 marine league = 3 nautical miles = 5556 m = 18228.347 ft (feet).

 

5,557

[Math.]  A prime number, formed by two consecutive odd numbers. (1-off repeated digits)

 

5,563

[Math.]  A prime number, formed by 2 of the 3 only known Wilson prime numbers: 5 and 563. The only other prime number formed by all 3 Wilson prime numbers is 556,313.

 

5,564

[Math.]  A pair of amicable numbers (5020, 5564).

 

5,565

[Math.]  A triangular number (sum of all integers from 1 to 105): 5565 = 1+2+…+104+105.

 

5,568

[Gov.]  All government-issued credit cards start with either 5568 (MasterCard) or 4486 & 4716 (Visa).

 

5,580

[Math.]  Sum (in degrees) of all internal angles of a 33-side polygon.