25!
= 15511210043330985984000000
Counts ordered arrangements of 25 distinct items.
Large Factorial Calculator
Compute exact factorials from 0 to 50,000. View full integer results, digit counts, and downloadable text.
How this calculation works
The factorial n! is the product of every integer from 1 through n. By definition 0! = 1. Factorials grow rapidly: even moderate inputs produce results beyond everyday calculator precision.
Inputs and accuracy
Use only the first input and enter a whole number from 0 to 50,000. Negative values and fractional inputs are not factorial inputs for this tool. Long calculations can be cancelled.
When to use it
Count ways to arrange distinct items in a row. For selecting only some items, the combinations and permutations calculators avoid manually dividing huge factorials.
Worked examples
0!
= 1
The empty arrangement has one possible ordering.
Related calculators
Large Number Addition Calculator
Add large integers and exact decimals without floating-point rounding. See every digit of the sum and copy the result in words.
Large Number Subtraction Calculator
Subtract huge numbers exactly, including negative and decimal values. Find precise differences and inspect every digit.
Large Number Multiplication Calculator
Multiply very large integers and exact decimals. View the full integer product or exact fraction without floating-point conversion.
Large Number Division Calculator
Divide large numbers with exact quotients, remainders, and reduced fractions. Inspect rounded decimals separately.
Large Number Power Calculator
Calculate exact large powers with whole-number exponents, including decimal bases and scientific-notation inputs.
Greatest Common Divisor Calculator
Find the exact GCD of two large integers. Simplify ratios and test common factors without rounding.
Least Common Multiple Calculator
Calculate the exact LCM of large whole numbers. Find common multiples and repeating cycle lengths.
Large Integer Square Root Calculator
Find the exact integer square root of a large non-negative whole number, rounded down without floating-point errors.
Large Number Combinations Calculator (nCr)
Calculate exact nCr combinations for large whole numbers. Count selections where order does not matter.
Large Number Permutations Calculator (nPr)
Compute exact nPr permutations. Count ordered selections from distinct items without replacement.
Big Integer Bitwise Calculator
Calculate bitwise AND, OR, XOR, and shifts on large integers. Enter hexadecimal, binary, octal, or decimal values.
Exact Decimal Calculator
Add, subtract, multiply, and divide decimals using exact fractions. Avoid floating-point errors such as 0.1 + 0.2.
Scientific Notation Calculator
Calculate with scientific-notation input such as 3.5e19. Parse large and tiny decimal values exactly as written, without floating-point conversion.