1556
1556 is the year of the deadliest earthquake in recorded history.
- Even
- Composite
Where 1556 fits
Why 1556 is special
The Shaanxi earthquake killed an estimated 830,000 people, many in cave dwellings cut into loess cliffs that collapsed. The dwelling type is what made the toll so high.
1556 connects to:
- historical years — appears in
- 1755 — contrasts with
Same number, different meanings
How 1556 is understood across different contexts — never implying one meaning because of another.
- Mathematics
The Shaanxi earthquake killed an estimated 830,000 people, many in cave dwellings cut into loess cliffs that collapsed. The dwelling type is what made the toll so high.
- History
In 1556, the Shaanxi earthquake killed an estimated 830,000 people, among the deadliest recorded (China).
- Science
The 1556 Shaanxi earthquake remains the deadliest recorded, with an estimated 830,000 deaths. Loess cave dwellings, comfortable and cheap, collapsed catastrophically — a building-practice failure as much as a seismic one.
1556 is part of
Factors & digit properties
- Divisors (6)
- 1, 2, 4, 389, 778, 1556
- Prime factorisation
- 2^2 × 389
- Digit sum
- 17
- Digital root
- 8
Representations
- Decimal
- 1556
- Scientific notation
- 1.556 × 10^3
Roman numerals
M D L V I
Binary
1 1 0 0 0 0 1 0 1 0 0
1 × 1,024 + 1 × 512 + 0 × 256 + 0 × 128 + 0 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 1 × 4 + 0 × 2 + 0 × 1 = 1,556
Octal
3 0 2 4
3 × 512 + 0 × 64 + 2 × 8 + 4 × 1 = 1,556
Hexadecimal
6 1 4
6 × 256 + 1 × 16 + 4 × 1 = 1,556
Read as powers of two: 1,024 + 512 + 16 + 4 = 1,556.
In historical numeral systems
Egyptian
1 lotus, 5 coils of rope, 5 hobbles, 6 strokes
1 × 1,000 + 5 × 100 + 5 × 10 + 6 × 1 = 1,556. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 corner wedges + 5 vertical wedges (sixties place), 5 corner wedges + 6 vertical wedges (units place)
25 × 60 + 56 = 1556. Places are separated by a space on the tablet, with the higher place written first.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Deficient number
Related numbers & connections
1556 is a year in the 16th century, in the 1550s.
The Shaanxi earthquake of 1556 remains the deadliest recorded, and the Lisbon earthquake of 1755 produced the first systematic scientific survey of one. Casualties and scientific consequence are unrelated.
View 1755 →Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
Other connections
- contrasts with1755
why?
Strength 0.50, confidence "high".
History
In 1556, the Shaanxi earthquake killed an estimated 830,000 people, among the deadliest recorded (China).
DocumentedHistoryGeography: ChinaPeriod: 1556
Science
The 1556 Shaanxi earthquake remains the deadliest recorded, with an estimated 830,000 deaths. Loess cave dwellings, comfortable and cheap, collapsed catastrophically — a building-practice failure as much as a seismic one.
DocumentedScienceGeography: ChinaPeriod: 1556
Common questions
Is 1556 a prime number?
No, 1556 is not prime.
What are the factors of 1556?
The factors of 1556 are 1, 2, 4, 389, 778, 1556.
What is 1556 in Roman numerals?
1556 in Roman numerals is MDLVI.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026