Number

667

667 is a composite number, odd, a calendar year.

Arithmetic Number Deficient Number Evil Number Recamán's Sequence Semiprime Squarefree Year

Historical context — 667 AD

Calendar year

Year 667 (DCLXVII) was a common year starting on Friday of the Julian calendar.

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Historical context — 667 BC

Calendar year

The year 667 BC was a year of the pre-Julian Roman 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: Tuesday
January 1, 667
Ended on: Tuesday
December 31, 667
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 660s
660–669
Century: 7th century
601–700
Millennium: 1st millennium
1–1000
Years ago: 1,359
1359 years before 2026.

In other calendars

Hebrew: 4427 / 4428 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 46 / 47 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Fire zodiac:Rabbit
Sexagenary cycle position 4 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1210 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 45 / 46 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 659 / 660 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 589 / 588 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 19
Digit product: 252
Digital root: 1
Palindrome: No
Bit width: 10 bits
Reversed: 766
Recamán's sequence: a(2,290) = 667
Square (n²): 444,889
Cube (n³): 296,740,963
Divisor count: 4
σ(n) — sum of divisors: 720
φ(n) — Euler's totient: 616
Sum of prime factors: 52

Primality

Prime factorization: 23 × 29

Nearest primes: 661 (−6) · 673 (+6)

Divisors & multiples

All divisors (4)

1 · 23 · 29 · 667

Aliquot sum (sum of proper divisors): 53

Factor pairs (a × b = 667)

1 × 667

23 × 29

First multiples

667 · 1,334 (double) · 2,001 · 2,668 · 3,335 · 4,002 · 4,669 · 5,336 · 6,003 · 6,670

Sums & aliquot sequence

As consecutive integers: 333 + 334 18 + 19 + … + 40 9 + 10 + … + 37

Aliquot sequence: 667 → 53 → 1 → 0 — terminates at zero

Representations

In words: six hundred sixty-seven
Ordinal: 667th
Roman numeral: DCLXVII
Binary: 1010011011
Octal: 1233
Hexadecimal: 0x29B
Base64: Aps=
One's complement: 64,868 (16-bit)

In other bases

ternary (3) 220201

quaternary (4) 22123

quinary (5) 10132

senary (6) 3031

septenary (7) 1642

nonary (9) 821

undecimal (11) 557

duodecimal (12) 477

tridecimal (13) 3c4

tetradecimal (14) 359

pentadecimal (15) 2e7

Historical numeral systems

Babylonian (base 60): 𒌋𒁹 𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): χξζʹ
Mayan (base 20): 𝋡·𝋭·𝋧
Chinese: 六百六十七
Chinese (financial): 陸佰陸拾柒

In other modern scripts

Eastern Arabic ٦٦٧ Devanagari ६६७ Bengali ৬৬৭ Tamil ௬௬௭ Thai ๖๖๗ Tibetan ༦༦༧ Khmer ៦៦៧ Lao ໖໖໗ Burmese ၆၆၇

Digit at this position in famous constants

π — Pi (π): Digit 667 = 3
e — Euler's number (e): Digit 667 = 9
φ — Golden ratio (φ): Digit 667 = 3
√2 — Pythagoras's (√2): Digit 667 = 6
ln 2 — Natural log of 2: Digit 667 = 3
γ — Euler-Mascheroni (γ): Digit 667 = 2

Also seen as

Unicode codepoint

Latin Letter Small Capital G With Hook

U+029B

Lowercase letter (Ll)

UTF-8 encoding: CA 9B (2 bytes).

Lookup U+029B on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00029B

RGB(0, 2, 155)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.155.

Address: 0.0.2.155
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.2.155

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

NANP area code 667

The number 667 is an active NANP area code (North American Numbering Plan).

Primary area: Baltimore
Region: Maryland
Country: United States

Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.

Look up area code 667 ↗