218038566916 has 27 divisors (see below), whose sum is σ = 398917981063. Its totient is φ = 104269041800.

The previous prime is 218038566899. The next prime is 218038566959. The reversal of 218038566916 is 619665830812.

The square root of 218038566916 is 466946.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

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 8 ways as a sum of consecutive naturals, for example, 21474441 + ... + 21484591.

Almost surely, 2^218038566916 is an apocalyptic number.

218038566916 is the 466946-th square number.

It is an amenable number.

218038566916 is a deficient number, since it is larger than the sum of its proper divisors (180879414147).

218038566916 is an frugal number, since it uses more digits than its factorization.

218038566916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20352 (or 10176 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 55.

The spelling of 218038566916 in words is "two hundred eighteen billion, thirty-eight million, five hundred sixty-six thousand, nine hundred sixteen".