556
The 556 is a dual 555 timer.
- Even
- Composite
Where 556 fits
Why 556 is special
Two independent timers in one package are how a single chip generates both a clock and a delay, which many 555 circuits need at once.
556 is part of
Factors & digit properties
- Divisors (6)
- 1, 2, 4, 139, 278, 556
- Prime factorisation
- 2^2 × 139
- Digit sum
- 16
- Digital root
- 7
Representations
- Decimal
- 556
- Binary
- 1000101100
- Octal
- 1054
- Hexadecimal
- 22c
- Roman numeral
- DLVI
- Scientific notation
- 5.560 × 10^2
Other mathematical patterns
- Deficient number
- Happy number
Related numbers & connections
The 556 is two complete 555 timers sharing a package, for designs needing both a clock and a delay.
View 555 →Other connections
- developed from555
why?
Strength 0.50, confidence "high".
Technology & computing
The 556 contains two complete 555 timer circuits sharing supply and ground pins, used where a design requires two independent timing functions.
DocumentedTechnology & computingPeriod: 1970s–
Common questions
Is 556 a prime number?
No, 556 is not prime.
What are the factors of 556?
The factors of 556 are 1, 2, 4, 139, 278, 556.
What is 556 in Roman numerals?
556 in Roman numerals is DLVI.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 3 August 2026