The number 16555
16555 is a composite number with 16 divisors. Its prime factorisation is 5 × 7 × 11 × 43. Divisors (16): 1, 5, 7, 11, 35, 43, 55, 77, 215, 301, 385, 473, 1505, 2365, 3311, 16555.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
16555 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
16555 is composite. Its prime factorisation is
- 3
The divisors add up to 25344; without 16555 itself that is 8789, so 16555 is deficient (8789 is less than 16555). Euler's totient φ(16555) = 10080 numbers up to 16555 share no factor with it.
- 4
The digits of 16555 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 115 steps to reach 1.
LaTeX source of the formulas on this page
\[ 16555 = 5 \times 7 \times 11 \times 43 \]
16555 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 25344 |
| Euler totient φ(n) | 10080 |
| Square | 274068025 |
| Cube | 4537196153875 |
| Square root | 128.666235 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 115 |
| Scientific notation | 1.6555 × |
16555 in other forms
| Form | Value |
|---|---|
| In words | sixteen thousand five hundred and fifty-five |
| Binary (base 2) | 100000010101011 |
| Octal (base 8) | 40253 |
| Hexadecimal (base 16) | 40AB |
| Base 3 | 211201011 |
| As time | 16555 seconds = 4 h 35 min 55 s |
Is 16555 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | No (remainder 1) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 1) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (16555 ÷ 5 = 3311) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | Yes (16555 ÷ 7 = 2365) | A number is divisible by 7 if double the last digit and subtract it from the rest: the result is a multiple of 7. |
| 8 | No (remainder 3) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 4) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (16555 ÷ 11 = 1505) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 16555 a prime number?
No. 16555 = 5 × 7 × 11 × 43, so it is divisible by 5.
What are the factors of 16555?
1, 5, 7, 11, 35, 43, 55, 77, 215, 301, 385, 473, 1505, 2365, 3311, 16555.
What is 16555 in binary?
100000010101011 (hexadecimal 40AB, octal 40253).
What is the square root of 16555?
About 128.6662.
Is 16555 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 16555?
It is a composite number with 16 divisors.