218118385 has 16 divisors (see below), whose sum is σ = 277545600. Its totient is φ = 164094336.

The previous prime is 218118359. The next prime is 218118413. The reversal of 218118385 is 583811812.

It is not a de Polignac number, because 218118385 - 2⁵ = 218118353 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4636 + ... + 21394.

It is an arithmetic number, because the mean of its divisors is an integer number (17346600).

Almost surely, 2^218118385 is an apocalyptic number.

It is an amenable number.

218118385 is a deficient number, since it is larger than the sum of its proper divisors (59427215).

218118385 is a wasteful number, since it uses less digits than its factorization.

218118385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16920.

The product of its digits is 15360, while the sum is 37.

The square root of 218118385 is about 14768.8315380737. The cubic root of 218118385 is about 601.9550900446.

The spelling of 218118385 in words is "two hundred eighteen million, one hundred eighteen thousand, three hundred eighty-five".