5550 has 24 divisors (see below), whose sum is σ = 14136. Its totient is φ = 1440.

The previous prime is 5531. The next prime is 5557. The reversal of 5550 is 555.

Added to its reverse (555) it gives a triangular number (6105 = T₁₁₀).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is an Ulam number.

It is a plaindrome in base 13 and base 16.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132 + ... + 168.

It is an arithmetic number, because the mean of its divisors is an integer number (589).

2⁵⁵⁵⁰ is an apocalyptic number.

5550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a pronic number, being equal to 74×75.

It is a practical number, because each smaller number is the sum of distinct divisors of 5550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7068).

5550 is an abundant number, since it is smaller than the sum of its proper divisors (8586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5550 is a wasteful number, since it uses less digits than its factorization.

5550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 125, while the sum is 15.

The square root of 5550 is about 74.4983221288. The cubic root of 5550 is about 17.7050705253.

Adding to 5550 its sum of digits (15), we get a triangular number (5565 = T₁₀₅).

Adding to 5550 its reverse (555), we get a triangular number (6105 = T₁₁₀).

It can be divided in two parts, 55 and 50, that added together give a triangular number (105 = T₁₄).

The spelling of 5550 in words is "five thousand, five hundred fifty".