55218422 has 8 divisors (see below), whose sum is σ = 94660176. Its totient is φ = 23665032.

The previous prime is 55218391. The next prime is 55218433. The reversal of 55218422 is 22481255.

55218422 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×55218422³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1972073 + ... + 1972100.

It is an arithmetic number, because the mean of its divisors is an integer number (11832522).

Almost surely, 2^55218422 is an apocalyptic number.

55218422 is a deficient number, since it is larger than the sum of its proper divisors (39441754).

55218422 is a wasteful number, since it uses less digits than its factorization.

55218422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3944182.

The product of its digits is 6400, while the sum is 29.

The square root of 55218422 is about 7430.9099039081. The cubic root of 55218422 is about 380.7980044487.

Adding to 55218422 its reverse (22481255), we get a palindrome (77699677).

The spelling of 55218422 in words is "fifty-five million, two hundred eighteen thousand, four hundred twenty-two".