55618 has 4 divisors (see below), whose sum is σ = 83430. Its totient is φ = 27808.

The previous prime is 55609. The next prime is 55619. The reversal of 55618 is 81655.

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., 42849 + 12769 = 207^2 + 113^2 .

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 55592 and 55601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55619) by changing a digit.

55618 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13903 + ... + 13906.

2⁵⁵⁶¹⁸ is an apocalyptic number.

55618 is a deficient number, since it is larger than the sum of its proper divisors (27812).

55618 is a wasteful number, since it uses less digits than its factorization.

55618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27811.

The product of its digits is 1200, while the sum is 25.

The square root of 55618 is about 235.8346878642. The cubic root of 55618 is about 38.1714322745.

The spelling of 55618 in words is "fifty-five thousand, six hundred eighteen".