16425

16425 is a five-digit integer. It is an odd number, as its last digit is 5. The sum of its digits is 1 + 6 + 4 + 2 + 5 = 18. Since 18 is divisible by 3 and 9, 16425 is also divisible by 3 and 9. Dividing 16425 by 3 yields 5475. Dividing 16425 by 9 yields 1825. As 16425 ends in 5, it is divisible by 5. Dividing 16425 by 5 results in 3285. Further division by 5 is possible, as 3285 also ends in 5, yielding 657. 657 is divisible by 3 and 9, as the sum of its digits is 6 + 5 + 7 = 18. 657 divided by 3 is 219. 657 divided by 9 is 73. 73 is a prime number. Therefore, the prime factorization of 16425 is 3 x 3 x 5 x 5 x 73, or 3^2 x 5^2 x 73. In scientific notation, 16425 can be written as approximately 1.6425 x 10^4.