556
556 is a composite number, even, a calendar year.
556 (five hundred fifty-six) is an even 3-digit number. It is a composite number with 6 divisors, and factors as 2² × 139. Written other ways, in Roman numerals it is DLVI and in binary, 1000101100.
Interestingness
Historical context — 556 AD
Calendar year
Year 556 (DLVI) was a leap year starting on Saturday of the Julian calendar.
Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 Read the full article on Wikipedia →
Historical context — 556 BC
Calendar year
The year 556 BC was a year of the pre-Julian Roman calendar.
Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 Read the full article on Wikipedia →
Year facts
- Year type
-
Leap year
Divisible by 4 and not by 100; February has 29 days.
- Days in year
- 366
- ISO weeks
-
53
Long year: contains 53 ISO weeks.
- Started on
-
Thursday
January 1, 556
- Ended on
-
Friday
December 31, 556
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
550s
550–559
- Century
-
6th century
501–600
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,470
1470 years before 2026.
In other calendars
- Hebrew
-
4316 / 4317 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Fire zodiac:Rat
Sexagenary cycle position 13 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1099 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
548 / 549 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
478 / 477 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 2 × 139
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√556 = [23; (1, 1, 2, 1, 1, 1, 3, 3, 2, 1, 5, 5, 15, 1, 1, 8, 1, 10, 1, 8, 1, 1, 15, 5, …)]
Period length 36 — the block in parentheses repeats forever.
Representations
- In words
- five hundred fifty-six
- Ordinal
- 556th
- Roman numeral
- DLVI
- Binary
- 1000101100
- Octal
- 1054
- Hexadecimal
- 0x22C
- Base64
- Aiw=
- One's complement
- 64,979 (16-bit)
- Scientific notation
- 5.56 × 10²
- As a duration
- 556 s = 9 minutes, 16 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- φνϛʹ
- Mayan (base 20)
- 𝋡·𝋧·𝋰
- Chinese
- 五百五十六
- Chinese (financial)
- 伍佰伍拾陸
Digit at this position in famous constants
- π — Pi (π)
- Digit 556 = 3
- e — Euler's number (e)
- Digit 556 = 9
- φ — Golden ratio (φ)
- Digit 556 = 8
- √2 — Pythagoras's (√2)
- Digit 556 = 3
- ln 2 — Natural log of 2
- Digit 556 = 5
- γ — Euler-Mascheroni (γ)
- Digit 556 = 3
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 556, here are decompositions:
- 47 + 509 = 556
- 53 + 503 = 556
- 89 + 467 = 556
- 107 + 449 = 556
- 113 + 443 = 556
- 137 + 419 = 556
- 167 + 389 = 556
- 173 + 383 = 556
Showing the first eight; more decompositions exist.
UTF-8 encoding: C8 AC (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.44.
- Address
- 0.0.2.44
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.2.44
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 556 Hz is closest to:
- Concert pitch (A4 = 440 Hz): C♯5 (554.4 Hz, +5¢)
- Scientific pitch (C4 = 256 Hz): C♯5 (542.4 Hz, +43¢)
- Baroque pitch (A4 = 415 Hz): D5 (554 Hz, +6¢)
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.