55018 has 4 divisors (see below), whose sum is σ = 82530. Its totient is φ = 27508.

The previous prime is 55009. The next prime is 55021. The reversal of 55018 is 81055.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 54289 + 729 = 233^2 + 27^2 .

It is an Ulam number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 54986 and 55004.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13753 + ... + 13756.

2⁵⁵⁰¹⁸ is an apocalyptic number.

55018 is a deficient number, since it is larger than the sum of its proper divisors (27512).

55018 is a wasteful number, since it uses less digits than its factorization.

55018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27511.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 55018 is about 234.5591609808. The cubic root of 55018 is about 38.0336728305.

The spelling of 55018 in words is "fifty-five thousand, eighteen".