Number

255

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

Arithmetic Number Deficient Number Evil Number Recamán's Sequence Self Number Sphenic Number Squarefree Year

Historical context — 255 AD

Calendar year

Year 255 (CCLV) was a common year starting on Monday of the Julian calendar.

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Historical context — 255 BC

Calendar year

Year 255 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, 255
Ended on: Monday
December 31, 255
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 250s
250–259
Century: 3rd century
201–300
Millennium: 1st millennium
1–1000
Years ago: 1,771
1771 years before 2026.

In other calendars

Hebrew: 4015 / 4016 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Wood zodiac:Pig
Sexagenary cycle position 12 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 798 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 247 / 248 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 177 / 176 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 12
Digit product: 50
Digital root: 3
Palindrome: No
Bit width: 8 bits
Reversed: 552
Recamán's sequence: a(1,345) = 255
Square (n²): 65,025
Cube (n³): 16,581,375
Divisor count: 8
σ(n) — sum of divisors: 432
φ(n) — Euler's totient: 128
Sum of prime factors: 25

Primality

Prime factorization: 3 × 5 × 17

Nearest primes: 251 (−4) · 257 (+2)

Divisors & multiples

All divisors (8)

1 · 3 · 5 · 15 · 17 · 51 · 85 · 255

Aliquot sum (sum of proper divisors): 177

Factor pairs (a × b = 255)

1 × 255

3 × 85

5 × 51

15 × 17

First multiples

255 · 510 (double) · 765 · 1,020 · 1,275 · 1,530 · 1,785 · 2,040 · 2,295 · 2,550

Sums & aliquot sequence

As consecutive integers: 127 + 128 84 + 85 + 86 49 + 50 + 51 + 52 + 53 40 + 41 + 42 + 43 + 44 + 45

Aliquot sequence: 255 → 177 → 63 → 41 → 1 → 0 — terminates at zero

Representations

In words: two hundred fifty-five
Ordinal: 255th
Roman numeral: CCLV
Binary: 11111111
Octal: 377
Hexadecimal: 0xFF
Base64: /w==
One's complement: 0 (8-bit)

In other bases

ternary (3) 100110

quaternary (4) 3333

quinary (5) 2010

senary (6) 1103

septenary (7) 513

nonary (9) 313

undecimal (11) 212

duodecimal (12) 193

tridecimal (13) 168

tetradecimal (14) 143

pentadecimal (15) 120

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): σνεʹ
Mayan (base 20): 𝋬·𝋯
Chinese: 二百五十五
Chinese (financial): 貳佰伍拾伍

In other modern scripts

Eastern Arabic ٢٥٥ Devanagari २५५ Bengali ২৫৫ Tamil ௨௫௫ Thai ๒๕๕ Tibetan ༢༥༥ Khmer ២៥៥ Lao ໒໕໕ Burmese ၂၅၅

Digit at this position in famous constants

π — Pi (π): Digit 255 = 4
e — Euler's number (e): Digit 255 = 6
φ — Golden ratio (φ): Digit 255 = 1
√2 — Pythagoras's (√2): Digit 255 = 5
ln 2 — Natural log of 2: Digit 255 = 8
γ — Euler-Mascheroni (γ): Digit 255 = 9

Also seen as

Unicode codepoint

Latin Small Letter Y With Diaeresis

U+00FF

Lowercase letter (Ll)

UTF-8 encoding: C3 BF (2 bytes).

Lookup U+00FF on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0000FF

RGB(0, 0, 255)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.255.

Address: 0.0.0.255
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.255

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