218720055 has 8 divisors (see below), whose sum is σ = 349952112. Its totient is φ = 116650688.

The previous prime is 218720053. The next prime is 218720063. The reversal of 218720055 is 550027812.

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

It is a cyclic number.

It is not a de Polignac number, because 218720055 - 2¹ = 218720053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218720053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7290654 + ... + 7290683.

It is an arithmetic number, because the mean of its divisors is an integer number (43744014).

Almost surely, 2^218720055 is an apocalyptic number.

218720055 is a deficient number, since it is larger than the sum of its proper divisors (131232057).

218720055 is a wasteful number, since it uses less digits than its factorization.

218720055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14581345.

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 218720055 is about 14789.1870973357. The cubic root of 218720055 is about 602.5080708043.

Adding to 218720055 its reverse (550027812), we get a palindrome (768747867).

The spelling of 218720055 in words is "two hundred eighteen million, seven hundred twenty thousand, fifty-five".