1,266
1,266 is a composite number, even, a calendar year.
Historical context — 1266 AD
Calendar year
Year 1266 (MCCLXVI) was a common year starting on Friday of the Julian calendar.
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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
-
Friday
January 1, 1266
- Ended on
-
Friday
December 31, 1266
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
1260s
1260–1269
- Century
-
13th century
1201–1300
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
760
760 years before 2026.
In other calendars
- Hebrew
-
5026 / 5027 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
664 / 665 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Fire zodiac:Tiger
Sexagenary cycle position 3 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1809 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
644 / 645 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1258 / 1259 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1188 / 1187 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 15
- Digit product
- 72
- Digital root
- 6
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 6,621
- Recamán's sequence
- a(8,456) = 1,266
- Square (n²)
- 1,602,756
- Cube (n³)
- 2,029,089,096
- Divisor count
- 8
- σ(n) — sum of divisors
- 2,544
- φ(n) — Euler's totient
- 420
- Sum of prime factors
- 216
Primality
Prime factorization: 2 × 3 × 211
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand two hundred sixty-six
- Ordinal
- 1266th
- Roman numeral
- MCCLXVI
- Binary
- 10011110010
- Octal
- 2362
- Hexadecimal
- 0x4F2
- Base64
- BPI=
- One's complement
- 64,269 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹 𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ασξϛʹ
- Mayan (base 20)
- 𝋣·𝋣·𝋦
- Chinese
- 一千二百六十六
- Chinese (financial)
- 壹仟貳佰陸拾陸
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,266 = 2
- e — Euler's number (e)
- Digit 1,266 = 5
- φ — Golden ratio (φ)
- Digit 1,266 = 4
- √2 — Pythagoras's (√2)
- Digit 1,266 = 9
- ln 2 — Natural log of 2
- Digit 1,266 = 9
- γ — Euler-Mascheroni (γ)
- Digit 1,266 = 4
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1266, here are decompositions:
- 7 + 1259 = 1266
- 17 + 1249 = 1266
- 29 + 1237 = 1266
- 37 + 1229 = 1266
- 43 + 1223 = 1266
- 53 + 1213 = 1266
- 73 + 1193 = 1266
- 79 + 1187 = 1266
Showing the first eight; more decompositions exist.
UTF-8 encoding: D3 B2 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.242.
- Address
- 0.0.4.242
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.242
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1266 first appears in π at position 4,160 of the decimal expansion (the 4,160ordinal-suffix:th digit after the integer 3).
Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.