160
160 is a composite number, even, a calendar year.
160 (one hundred sixty) is an even 3-digit number. It is a composite number with 12 divisors, and factors as 2⁵ × 5. Its proper divisors sum to 218, more than the number itself, making it an abundant number. Written other ways, in Roman numerals it is CLX and in binary, 10100000.
Interestingness
Historical context — 160 AD
Calendar year
Year 160 (CLX) was a leap year starting on Monday of the Julian calendar.
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Historical context — 160 BC
Calendar year
Year 160 BC was a year of the pre-Julian Roman calendar.
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Year facts
- Year type
-
Leap year
Divisible by 4 and not by 100; February has 29 days.
- Days in year
- 366
- ISO weeks
- 52
- Started on
-
Tuesday
January 1, 160
- Ended on
-
Wednesday
December 31, 160
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
160s
160–169
- Century
-
2nd century
101–200
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,866
1866 years before 2026.
In other calendars
- Hebrew
-
3920 / 3921 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Metal zodiac:Rat
Sexagenary cycle position 37 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
703 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
152 / 153 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
82 / 81 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 5 × 5
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√160 = [12; (1, 1, 1, 5, 1, 1, 1, 24)]
Period length 8 — the block in parentheses repeats forever.
Representations
- In words
- one hundred sixty
- Ordinal
- 160th
- Roman numeral
- CLX
- Binary
- 10100000
- Octal
- 240
- Hexadecimal
- 0xA0
- Base64
- oA==
- One's complement
- 95 (8-bit)
- Scientific notation
- 1.6 × 10²
- As a duration
- 160 s = 2 minutes, 40 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹 𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓍢𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ρξʹ
- Mayan (base 20)
- 𝋨·𝋠
- Chinese
- 一百六十
- Chinese (financial)
- 壹佰陸拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 160 = 0
- e — Euler's number (e)
- Digit 160 = 8
- φ — Golden ratio (φ)
- Digit 160 = 3
- √2 — Pythagoras's (√2)
- Digit 160 = 3
- ln 2 — Natural log of 2
- Digit 160 = 0
- γ — Euler-Mascheroni (γ)
- Digit 160 = 3
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 160, here are decompositions:
- 3 + 157 = 160
- 11 + 149 = 160
- 23 + 137 = 160
- 29 + 131 = 160
- 47 + 113 = 160
- 53 + 107 = 160
- 59 + 101 = 160
- 71 + 89 = 160
Showing the first eight; more decompositions exist.
UTF-8 encoding: C2 A0 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.160.
- Address
- 0.0.0.160
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.0.160
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 160 Hz is closest to:
- Concert pitch (A4 = 440 Hz): D♯3 (155.6 Hz, +49¢ — about midway to E3)
- Scientific pitch (C4 = 256 Hz): E3 (161.3 Hz, -14¢)
- Baroque pitch (A4 = 415 Hz): E3 (155.4 Hz, +50¢ — about midway to F3)
On an ingredients label, E160 is Carotenes, a food colour — the orange of carrots.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.