218219855 has 16 divisors (see below), whose sum is σ = 300801600. Its totient is φ = 148872192.

The previous prime is 218219851. The next prime is 218219857. The reversal of 218219855 is 558912812.

It is not a de Polignac number, because 218219855 - 2² = 218219851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218219851) 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, 8930 + ... + 22719.

It is an arithmetic number, because the mean of its divisors is an integer number (18800100).

Almost surely, 2^218219855 is an apocalyptic number.

218219855 is a deficient number, since it is larger than the sum of its proper divisors (82581745).

218219855 is a wasteful number, since it uses less digits than its factorization.

218219855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31858.

The product of its digits is 57600, while the sum is 41.

The square root of 218219855 is about 14772.2664137904. The cubic root of 218219855 is about 602.0484199638.

The spelling of 218219855 in words is "two hundred eighteen million, two hundred nineteen thousand, eight hundred fifty-five".