Number

655

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

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

Historical context — 655 AD

Calendar year

Year 655 (DCLV) was a common year starting on Thursday of the Julian calendar.

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Historical context — 655 BC

Calendar year

The year 655 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: Monday
January 1, 655
Ended on: Monday
December 31, 655
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 650s
650–659
Century: 7th century
601–700
Millennium: 1st millennium
1–1000
Years ago: 1,371
1371 years before 2026.

In other calendars

Hebrew: 4415 / 4416 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 34 / 35 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Wood zodiac:Rabbit
Sexagenary cycle position 52 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1198 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 33 / 34 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 647 / 648 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 577 / 576 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 16
Digit product: 150
Digital root: 7
Palindrome: No
Bit width: 10 bits
Reversed: 556
Recamán's sequence: a(2,314) = 655
Square (n²): 429,025
Cube (n³): 281,011,375
Divisor count: 4
σ(n) — sum of divisors: 792
φ(n) — Euler's totient: 520
Sum of prime factors: 136

Primality

Prime factorization: 5 × 131

Nearest primes: 653 (−2) · 659 (+4)

Divisors & multiples

All divisors (4)

1 · 5 · 131 · 655

Aliquot sum (sum of proper divisors): 137

Factor pairs (a × b = 655)

1 × 655

5 × 131

First multiples

655 · 1,310 (double) · 1,965 · 2,620 · 3,275 · 3,930 · 4,585 · 5,240 · 5,895 · 6,550

Sums & aliquot sequence

As consecutive integers: 327 + 328 129 + 130 + 131 + 132 + 133 61 + 62 + … + 70

Aliquot sequence: 655 → 137 → 1 → 0 — terminates at zero

Representations

In words: six hundred fifty-five
Ordinal: 655th
Roman numeral: DCLV
Binary: 1010001111
Octal: 1217
Hexadecimal: 0x28F
Base64: Ao8=
One's complement: 64,880 (16-bit)

In other bases

ternary (3) 220021

quaternary (4) 22033

quinary (5) 10110

senary (6) 3011

septenary (7) 1624

nonary (9) 807

undecimal (11) 546

duodecimal (12) 467

tridecimal (13) 3b5

tetradecimal (14) 34b

pentadecimal (15) 2da

Historical numeral systems

Babylonian (base 60): 𒌋 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): χνεʹ
Mayan (base 20): 𝋡·𝋬·𝋯
Chinese: 六百五十五
Chinese (financial): 陸佰伍拾伍

In other modern scripts

Eastern Arabic ٦٥٥ Devanagari ६५५ Bengali ৬৫৫ Tamil ௬௫௫ Thai ๖๕๕ Tibetan ༦༥༥ Khmer ៦៥៥ Lao ໖໕໕ Burmese ၆၅၅

Digit at this position in famous constants

π — Pi (π): Digit 655 = 8
e — Euler's number (e): Digit 655 = 1
φ — Golden ratio (φ): Digit 655 = 8
√2 — Pythagoras's (√2): Digit 655 = 0
ln 2 — Natural log of 2: Digit 655 = 0
γ — Euler-Mascheroni (γ): Digit 655 = 7

Also seen as

Unicode codepoint

Latin Letter Small Capital Y

U+028F

Lowercase letter (Ll)

UTF-8 encoding: CA 8F (2 bytes).

Lookup U+028F on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00028F

RGB(0, 2, 143)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.143.

Address: 0.0.2.143
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.2.143

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