Number Gossip

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Unique Properties of 55

  • 55 is the largest triangular number in the Fibonacci sequence
  • 55 is the smallest multi-digit triangular number which is a palindrome
  • 55 is the product of the smallest sexy prime pair
  • 55 is the only multi-digit Fibonacci number using one digit
  • 55 is the smallest number sandwiched between two numbers that are products for four primes

Rare Properties of 55

Fibonacci

Common Properties of 55

Composite
Deficient
Odd
Odious
Palindrome
Square-free
Triangular