1,663
1,663 is a prime, odd, a calendar year.
1,663 (one thousand six hundred sixty-three) is an odd 4-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in Roman numerals it is MDCLXIII and in binary, 11001111111.
Interestingness
Notable events — 1663 AD
- Sep 9 King Philip's War predecessor: Ottoman vizier Köprülü Ahmed leads campaigns into Hungary.
- Mar 24 Charles II grants the Carolina charter.
- Jul 27 England passes the second Navigation Act.
Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0
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
-
Monday
January 1, 1663
- Ended on
-
Monday
December 31, 1663
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Easter Sunday
-
March 25
Sunday, March 25, 1663
- Decade
-
1660s
1660–1669
- Century
-
17th century
1601–1700
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
363
363 years before 2026.
In other calendars
- Hebrew
-
5423 / 5424 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1073 / 1074 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Water zodiac:Rabbit
Sexagenary cycle position 40 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2206 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1041 / 1042 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1655 / 1656 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1585 / 1584 Saka
Indian national calendar; year starts in March.
Properties
Primality
1,663 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,663 = [40; (1, 3, 1, 1, 5, 3, 1, 2, 2, 1, 1, 1, 12, 1, 26, 3, 1, 5, 1, 1, 11, 8, 1, 39, …)]
Period length 48 — the block in parentheses repeats forever.
Representations
- In words
- one thousand six hundred sixty-three
- Ordinal
- 1663rd
- Roman numeral
- MDCLXIII
- Binary
- 11001111111
- Octal
- 3177
- Hexadecimal
- 0x67F
- Base64
- Bn8=
- One's complement
- 63,872 (16-bit)
- Scientific notation
- 1.663 × 10³
- As a duration
- 1,663 s = 27 minutes, 43 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺
- Greek (Milesian)
- ͵αχξγʹ
- Mayan (base 20)
- 𝋤·𝋣·𝋣
- Chinese
- 一千六百六十三
- Chinese (financial)
- 壹仟陸佰陸拾參
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,663 = 2
- e — Euler's number (e)
- Digit 1,663 = 9
- φ — Golden ratio (φ)
- Digit 1,663 = 9
- √2 — Pythagoras's (√2)
- Digit 1,663 = 4
- ln 2 — Natural log of 2
- Digit 1,663 = 7
- γ — Euler-Mascheroni (γ)
- Digit 1,663 = 0
Also seen as
UTF-8 encoding: D9 BF (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.127.
- Address
- 0.0.6.127
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.6.127
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,663 Hz is closest to:
- Concert pitch (A4 = 440 Hz): G♯6 (1661.2 Hz, +2¢)
- Scientific pitch (C4 = 256 Hz): G♯6 (1625.5 Hz, +39¢)
- Baroque pitch (A4 = 415 Hz): A6 (1660 Hz, +3¢)
The digit sequence 1663 first appears in π at position 15,597 of the decimal expansion (the 15,597ordinal-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.
Related reading
- Prime numbers — The building blocks of arithmetic: what primes are, why they matter, and how we find them.
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.