1,602,176,634
1,602,176,634 is the digit string of the elementary charge, exactly 1.602176634 × 10⁻¹⁹ coulombs since 2019.
- Even
- Composite
Where 1,602,176,634 fits
Why 1,602,176,634 is special
Fixing it defined the ampere. Before 2019 the ampere was defined by the force between two infinitely long parallel wires — an experiment nobody could perform — and the charge on an electron was measured against it. Now the charge is exact and the ampere is derived, which is the more useful way round.
1,602,176,634 is part of
Factors & digit properties
- Divisors (48)
- 1, 2, 3, 6, 9, 18, 19, 38, 57, 114, 171, 342, 389, 778, 1167, 2334, 3501, 7002, 7391, 12043, 14782, 22173, 24086, 36129, 44346, 66519, 72258, 108387, 133038, 216774, 228817, 457634, 686451, 1372902, 2059353, 4118706, 4684727, 9369454, 14054181, 28108362, 42162543, 84325086, 89009813, 178019626, 267029439, 534058878, 801088317, 1602176634
- Prime factorisation
- 2 × 3^2 × 19 × 389 × 12043
- Digit sum
- 36
- Digital root
- 9
Representations
- Decimal
- 1602176634
- Scientific notation
- 1.602 × 10^9
Roman numerals
Roman numerals as modelled here goes up to 3,999.
Binary
Binary (base 2) as modelled here goes up to 1,000,000,000.
Octal
Octal (base 8) as modelled here goes up to 1,000,000,000.
Hexadecimal
Hexadecimal (base 16) as modelled here goes up to 1,000,000,000.
Other mathematical patterns
- Abundant number
- Happy number
Related numbers & connections
1602176634 appears in Numbers in physics, the topic covering numbers that carry a documented physics fact.
Numbers Around Us
- appears inPhysics
why?
Strength 0.50, confidence "high".
Science
The digit string of the elementary charge in coulombs is 1,602,176,634 (worldwide, since the 2019 redefinition). It stopped being measured in 2019 and became a definition: the coulomb is now whatever makes this figure exact. The uncertainty did not fall to zero so much as move, from the charge to the instruments that realise it.
DocumentedScienceGeography: worldwide, since the 2019 redefinition
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 15 July 2026