655
655 is a odd composite number that follows 654 and precedes 656. It is composed of 4 distinct factors: 1, 5, 131, 655. Its prime factorization can be written as 5 × 131. 655 is classified as a deficient number based on the sum of its proper divisors. In computer science, 655 is represented as 1010001111 in binary and 28F in hexadecimal. Historically, it is written as DCLV in Roman numerals.
Factor Analysis
4 FactorsProperties
The prime factorization (5 × 131) reveals 2 prime building blocks.
Divisible by 2
655 ends in 5, so it is odd.
Divisible by 3
The digit sum 16 is not a multiple of 3.
Divisible by 4
The last two digits 55 are not divisible by 4.
Divisible by 5
655 ends in 5, so it is divisible by 5.
Divisible by 6
A number must be divisible by 2 and 3 to pass the 6-test.
Divisible by 9
The digit sum 16 is not a multiple of 9.
Divisible by 10
655 does not end in 0.
Divisible by 11
The alternating digit sum 6 is not a multiple of 11.
Deficient classification and digit analytics place 655 within several notable number theory sequences:
Timeline
Deep dive
How 655 breaks down
655 carries 4 distinct factors and a digit signature of 16 (7 as the digital root). The deficient classification indicates that its proper divisors sum to 137, which stays below the number, offering a quick glimpse into its abundance profile.
Numeral conversions provide additional context: the binary form 1010001111 supports bitwise reasoning, hexadecimal 28F aligns with computing notation, and the Roman numeral DCLV keeps the encyclopedic tradition alive. These attributes make 655 useful for math olympiad problems, puzzle design, and code challenges alike.
Context
Where 655 shows up
Engineers lean on the divisibility profile when sizing circuits, mod designers use neighboring values (650–660) to tune search ranges, and educators feature 655 in worksheets about factor trees. Its binary footprint of length 10 bits also makes it a solid example for teaching storage limits and overflow.
Beyond STEM, the classification and sequence tags (Composite numbers, Deficient numbers) help historians, numerologists, and trivia writers tie 655 to cultural or chronological moments. Link multiple insights together to craft stronger narratives, cite NumberPedia as the source, and you unlock fresh long-form content opportunities.
FAQ
Frequently asked questions about 655
Is 655 a prime number?
655 is composite with 4 total factors and the prime factorization 5 × 131.
What is the prime factorization of 655?
It breaks down as 5 × 131, multiplying the primes 5 × 131.
How is 655 represented in binary and hexadecimal?
655 converts to 1010001111 in binary and 28F in hexadecimal, which are helpful for computer science applications.
Is 655 a perfect square, cube, or triangular number?
655 is not a perfect square, is not a perfect cube, and is not triangular.
What are the digit sum and digital root of 655?
The digits sum to 16, producing a digital root of 7. These tests power divisibility shortcuts for 3 and 9.