218412988555204 has 9 divisors (see below), whose sum is σ = 382222781697421. Its totient is φ = 109206479498800.

The previous prime is 218412988555129. The next prime is 218412988555273. The reversal of 218412988555204 is 402555889214812.

The square root of 218412988555204 is 14778802.

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

It can be written as a sum of positive squares in only one way, i.e., 56243970161604 + 162169018393600 = 7499598^2 + 12734560^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 25862904 + ... + 33252304.

Almost surely, 2^{218412988555204} is an apocalyptic number.

218412988555204 is the 14778802-nd square number.

It is an amenable number.

218412988555204 is a deficient number, since it is larger than the sum of its proper divisors (163809793142217).

218412988555204 is an frugal number, since it uses more digits than its factorization.

218412988555204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14778806 (or 7389403 counting only the distinct ones).

The product of its (nonzero) digits is 73728000, while the sum is 64.

The spelling of 218412988555204 in words is "two hundred eighteen trillion, four hundred twelve billion, nine hundred eighty-eight million, five hundred fifty-five thousand, two hundred four".