16565

16565 is a number that falls between 16564 and 16566 in the sequence of natural numbers. It is an odd number, as it cannot be evenly divided by 2. In the decimal system, it is written as "sixteen thousand five hundred sixty-five." In scientific notation, it is expressed as 1.6565 x 10^4.

The number 16565 has several mathematical properties. It is a composite number, meaning it has factors other than 1 and itself. Its prime factorization is 5 x 7 x 473. It is also a Harshad number, as it is divisible by the sum of its digits (1+6+5+6+5=23).

In the context of the International Telecommunication Union (ITU) plan for numbering telephone lines, 16565 is a country calling code for the United States. This code is used when making international calls to the US from other countries.

In popular culture, 16565 is not particularly notable. It does not have any significant historical or cultural references. However, it is often used in mathematical puzzles and games as a test number.