218418664 has 32 divisors (see below), whose sum is σ = 415411200. Its totient is φ = 107654400.

The previous prime is 218418637. The next prime is 218418677. The reversal of 218418664 is 466814812.

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 7 ways as a sum of consecutive naturals, for example, 181264 + ... + 182464.

It is an arithmetic number, because the mean of its divisors is an integer number (12981600).

Almost surely, 2^218418664 is an apocalyptic number.

It is an amenable number.

218418664 is a deficient number, since it is larger than the sum of its proper divisors (196992536).

218418664 is a wasteful number, since it uses less digits than its factorization.

218418664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1513 (or 1509 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The square root of 218418664 is about 14778.9940117722. The cubic root of 218418664 is about 602.2311963571.

The spelling of 218418664 in words is "two hundred eighteen million, four hundred eighteen thousand, six hundred sixty-four".