168
168 is a composite number, even, a calendar year.
Historical context — 168 AD
Calendar year
Year 168 (CLXVIII) was a leap year starting on Thursday of the Julian calendar.
Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback Read the full article on Wikipedia →
Notable events — 168 BC
- Jun 22 Rome decisively defeats Macedon at Pydna.
Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0
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
-
Friday
January 1, 168
- Ended on
-
Saturday
December 31, 168
- 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
-
1,858
1858 years before 2026.
In other calendars
- Hebrew
-
3928 / 3929 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Earth zodiac:Monkey
Sexagenary cycle position 45 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
711 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
160 / 161 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
90 / 89 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 3
- Digit sum
- 15
- Digit product
- 48
- Digital root
- 6
- Palindrome
- No
- Bit width
- 8 bits
- Reversed
- 861
- Flips to (rotate 180°)
- 891
- Recamán's sequence
- a(331) = 168
- Square (n²)
- 28,224
- Cube (n³)
- 4,741,632
- Divisor count
- 16
- σ(n) — sum of divisors
- 480
- φ(n) — Euler's totient
- 48
- Sum of prime factors
- 16
Primality
Prime factorization: 2 3 × 3 × 7
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one hundred sixty-eight
- Ordinal
- 168th
- Roman numeral
- CLXVIII
- Binary
- 10101000
- Octal
- 250
- Hexadecimal
- 0xA8
- Base64
- qA==
- One's complement
- 87 (8-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ρξηʹ
- Mayan (base 20)
- 𝋨·𝋨
- Chinese
- 一百六十八
- Chinese (financial)
- 壹佰陸拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 168 = 0
- e — Euler's number (e)
- Digit 168 = 2
- φ — Golden ratio (φ)
- Digit 168 = 9
- √2 — Pythagoras's (√2)
- Digit 168 = 2
- ln 2 — Natural log of 2
- Digit 168 = 2
- γ — Euler-Mascheroni (γ)
- Digit 168 = 4
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 168, here are decompositions:
- 5 + 163 = 168
- 11 + 157 = 168
- 17 + 151 = 168
- 19 + 149 = 168
- 29 + 139 = 168
- 31 + 137 = 168
- 37 + 131 = 168
- 41 + 127 = 168
Showing the first eight; more decompositions exist.
UTF-8 encoding: C2 A8 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.168.
- Address
- 0.0.0.168
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.0.168
Unspecified address (0.0.0.0/8) — "this network" placeholder.