Number

556

556 is a composite number, even, a calendar year.

Deficient Number Evil Number Happy Number Recamán's Sequence Year

Historical context — 556 AD

Calendar year

Year 556 (DLVI) was a leap year starting on Saturday of the Julian calendar.

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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 · English fallback 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

Parity: Even
Digit count: 3
Digit sum: 16
Digit product: 150
Digital root: 7
Palindrome: No
Bit width: 10 bits
Reversed: 655
Recamán's sequence: a(1,147) = 556
Square (n²): 309,136
Cube (n³): 171,879,616
Divisor count: 6
σ(n) — sum of divisors: 980
φ(n) — Euler's totient: 276
Sum of prime factors: 143

Primality

Prime factorization: 2 ² × 139

Nearest primes: 547 (−9) · 557 (+1)

Divisors & multiples

All divisors (6)

1 · 2 · 4 · 139 · 278 (half) · 556

Aliquot sum (sum of proper divisors): 424

Factor pairs (a × b = 556)

1 × 556

2 × 278

4 × 139

First multiples

556 · 1,112 (double) · 1,668 · 2,224 · 2,780 · 3,336 · 3,892 · 4,448 · 5,004 · 5,560

Sums & aliquot sequence

As consecutive integers: 66 + 67 + … + 73

Aliquot sequence: 556 → 424 → 386 → 196 → 203 → 37 → 1 → 0 — terminates at zero

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)

In other bases

ternary (3) 202121

quaternary (4) 20230

quinary (5) 4211

senary (6) 2324

septenary (7) 1423

nonary (9) 677

undecimal (11) 466

duodecimal (12) 3a4

tridecimal (13) 33a

tetradecimal (14) 2ba

pentadecimal (15) 271

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

In other modern scripts

Eastern Arabic ٥٥٦ Devanagari ५५६ Bengali ৫৫৬ Tamil ௫௫௬ Thai ๕๕๖ Tibetan ༥༥༦ Khmer ៥៥៦ Lao ໕໕໖ Burmese ၅၅၆

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 decomposition

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.

Unicode codepoint

Latin Capital Letter O With Tilde And Macron

U+022C

Uppercase letter (Lu)

UTF-8 encoding: C8 AC (2 bytes).

Lookup U+022C on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00022C

RGB(0, 2, 44)

IPv4 address

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.