55218603 has 16 divisors (see below), whose sum is σ = 81637632. Its totient is φ = 32916000.

The previous prime is 55218599. The next prime is 55218613. The reversal of 55218603 is 30681255.

55218603 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55218603 - 2² = 55218599 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55218613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11703 + ... + 15728.

It is an arithmetic number, because the mean of its divisors is an integer number (5102352).

Almost surely, 2^55218603 is an apocalyptic number.

55218603 is a deficient number, since it is larger than the sum of its proper divisors (26419029).

55218603 is a wasteful number, since it uses less digits than its factorization.

55218603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27506.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 55218603 is about 7430.9220827566. The cubic root of 55218603 is about 380.7984205197.

Adding to 55218603 its reverse (30681255), we get a palindrome (85899858).

The spelling of 55218603 in words is "fifty-five million, two hundred eighteen thousand, six hundred three".