Number

265

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

Arithmetic Number Deficient Number Odious Number Padovan Number Pernicious Number Recamán's Sequence Semiprime Smith Number Squarefree Year

Historical context — 265 AD

Calendar year

Year 265 (CCLXV) was a common year starting on Sunday of the Julian calendar.

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Historical context — 265 BC

Calendar year

Year 265 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: Sunday
January 1, 265
Ended on: Sunday
December 31, 265
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 260s
260–269
Century: 3rd century
201–300
Millennium: 1st millennium
1–1000
Years ago: 1,761
1761 years before 2026.

In other calendars

Hebrew: 4025 / 4026 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Wood zodiac:Rooster
Sexagenary cycle position 22 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 808 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 257 / 258 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 187 / 186 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 13
Digit product: 60
Digital root: 4
Palindrome: No
Bit width: 9 bits
Reversed: 562
Recamán's sequence: a(101) = 265
Square (n²): 70,225
Cube (n³): 18,609,625
Divisor count: 4
σ(n) — sum of divisors: 324
φ(n) — Euler's totient: 208
Sum of prime factors: 58

Primality

Prime factorization: 5 × 53

Nearest primes: 263 (−2) · 269 (+4)

Divisors & multiples

All divisors (4)

1 · 5 · 53 · 265

Aliquot sum (sum of proper divisors): 59

Factor pairs (a × b = 265)

1 × 265

5 × 53

First multiples

265 · 530 (double) · 795 · 1,060 · 1,325 · 1,590 · 1,855 · 2,120 · 2,385 · 2,650

Sums & aliquot sequence

As a sum of two squares: 3² + 16² = 11² + 12²

As consecutive integers: 132 + 133 51 + 52 + 53 + 54 + 55 22 + 23 + … + 31

Aliquot sequence: 265 → 59 → 1 → 0 — terminates at zero

Representations

In words: two hundred sixty-five
Ordinal: 265th
Roman numeral: CCLXV
Binary: 100001001
Octal: 411
Hexadecimal: 0x109
Base64: AQk=
One's complement: 65,270 (16-bit)

In other bases

ternary (3) 100211

quaternary (4) 10021

quinary (5) 2030

senary (6) 1121

septenary (7) 526

nonary (9) 324

undecimal (11) 221

duodecimal (12) 1a1

tridecimal (13) 175

tetradecimal (14) 14d

pentadecimal (15) 12a

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): σξεʹ
Mayan (base 20): 𝋭·𝋥
Chinese: 二百六十五
Chinese (financial): 貳佰陸拾伍

In other modern scripts

Eastern Arabic ٢٦٥ Devanagari २६५ Bengali ২৬৫ Tamil ௨௬௫ Thai ๒๖๕ Tibetan ༢༦༥ Khmer ២៦៥ Lao ໒໖໕ Burmese ၂၆၅

Digit at this position in famous constants

π — Pi (π): Digit 265 = 0
e — Euler's number (e): Digit 265 = 7
φ — Golden ratio (φ): Digit 265 = 8
√2 — Pythagoras's (√2): Digit 265 = 4
ln 2 — Natural log of 2: Digit 265 = 7
γ — Euler-Mascheroni (γ): Digit 265 = 5

Also seen as

Unicode codepoint

Latin Small Letter C With Circumflex

U+0109

Lowercase letter (Ll)

UTF-8 encoding: C4 89 (2 bytes).

Lookup U+0109 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000109

RGB(0, 1, 9)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.9.

Address: 0.0.1.9
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.1.9

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