The number of seconds in an average Gregorian year (365.2425 days)

The speed of light, in meters per second

The theoretical number of 32-bit IP addresses

The number of base-pairs in the human genome, for a male individual (one X and one Y chromosome; estimate)

The largest number that can be formed by combining the digits 1, 2 and 3 with operators

A highly composite number with 5040 divisors

The largest value on a single paper currency note

The number of 13-card 'hands' from a 52-card deck

The number of ways to make a map of the 48 contiguous states of the US plus DC, using 4 colors, such that no two states that share a border are of the same color

The number of cells in the human body (estimate)

The number of Ethernet MAC addresses (12 hexadecimal digits)

The number of meters in a light year

The age of the universe in seconds (estimate)

The number of ways to arrange a 3x3x3 Rubik's Cube

The number of possible solution patterns to Sudoku puzzles

The number of carbon atoms in 12 grams of carbon (Avogadro's number)

The mass of the Sun in kilograms (estimate)

A known factor of a googolplex plus one (10^10^100+1)

The largest square whose digits are all squares

The number of charged particles in the universe