Number

566

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

Arithmetic Number Deficient Number Happy Number Odious Number Pernicious Number Recamán's Sequence Semiprime Squarefree Year

Historical context — 566 AD

Calendar year

566 (DLXVI) was a common year starting on Friday of the Julian calendar.

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Historical context — 566 BC

Year

The year 566 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: Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
Days in year: 365
ISO weeks: 52
Started on: Wednesday
January 1, 566
Ended on: Wednesday
December 31, 566
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 560s
560–569
Century: 6th century
501–600
Millennium: 1st millennium
1–1000
Years ago: 1,460
1460 years before 2026.

In other calendars

Hebrew: 4326 / 4327 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Fire zodiac:Dog
Sexagenary cycle position 23 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1109 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 558 / 559 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 488 / 487 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 3
Digit sum: 17
Digit product: 180
Digital root: 8
Palindrome: No
Bit width: 10 bits
Reversed: 665
Recamán's sequence: a(1,127) = 566
Square (n²): 320,356
Cube (n³): 181,321,496
Divisor count: 4
σ(n) — sum of divisors: 852
φ(n) — Euler's totient: 282
Sum of prime factors: 285

Primality

Prime factorization: 2 × 283

Nearest primes: 563 (−3) · 569 (+3)

Divisors & multiples

All divisors (4)

1 · 2 · 283 (half) · 566

Aliquot sum (sum of proper divisors): 286

Factor pairs (a × b = 566)

1 × 566

2 × 283

First multiples

566 · 1,132 (double) · 1,698 · 2,264 · 2,830 · 3,396 · 3,962 · 4,528 · 5,094 · 5,660

Sums & aliquot sequence

As consecutive integers: 140 + 141 + 142 + 143

Aliquot sequence: 566 → 286 → 218 → 112 → 136 → 134 → 70 → 74 → 40 → 50 → 43 → 1 → 0 — terminates at zero

Representations

In words: five hundred sixty-six
Ordinal: 566th
Roman numeral: DLXVI
Binary: 1000110110
Octal: 1066
Hexadecimal: 0x236
Base64: AjY=
One's complement: 64,969 (16-bit)

In other bases

ternary (3) 202222

quaternary (4) 20312

quinary (5) 4231

senary (6) 2342

septenary (7) 1436

nonary (9) 688

undecimal (11) 475

duodecimal (12) 3b2

tridecimal (13) 347

tetradecimal (14) 2c6

pentadecimal (15) 27b

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): φξϛʹ
Mayan (base 20): 𝋡·𝋨·𝋦
Chinese: 五百六十六
Chinese (financial): 伍佰陸拾陸

In other modern scripts

Eastern Arabic ٥٦٦ Devanagari ५६६ Bengali ৫৬৬ Tamil ௫௬௬ Thai ๕๖๖ Tibetan ༥༦༦ Khmer ៥៦៦ Lao ໕໖໖ Burmese ၅၆၆

Digit at this position in famous constants

π — Pi (π): Digit 566 = 2
e — Euler's number (e): Digit 566 = 1
φ — Golden ratio (φ): Digit 566 = 9
√2 — Pythagoras's (√2): Digit 566 = 5
ln 2 — Natural log of 2: Digit 566 = 6
γ — Euler-Mascheroni (γ): Digit 566 = 6

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 566, here are decompositions:

3 + 563 = 566
19 + 547 = 566
43 + 523 = 566
67 + 499 = 566
79 + 487 = 566
103 + 463 = 566
109 + 457 = 566
127 + 439 = 566

Showing the first eight; more decompositions exist.

Unicode codepoint

Latin Small Letter T With Curl

U+0236

Lowercase letter (Ll)

UTF-8 encoding: C8 B6 (2 bytes).

Lookup U+0236 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000236

RGB(0, 2, 54)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.54.

Address: 0.0.2.54
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.2.54

Unspecified address (0.0.0.0/8) — "this network" placeholder.