218468368836 has 135 divisors (see below), whose sum is σ = 597559654461. Its totient is φ = 69594883776.

The previous prime is 218468368753. The next prime is 218468368871. The reversal of 218468368836 is 638863864812.

The square root of 218468368836 is 467406.

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

218468368836 is a `hidden beast` number, since 2 + 184 + 68 + 368 + 8 + 36 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18552074436 + 199916294400 = 136206^2 + 447120^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 193505520 + ... + 193506648.

Almost surely, 2^218468368836 is an apocalyptic number.

218468368836 is the 467406-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218468368836

218468368836 is an abundant number, since it is smaller than the sum of its proper divisors (379091285625).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218468368836 is an equidigital number, since it uses as much as digits as its factorization.

218468368836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320 (or 1157 counting only the distinct ones).

The product of its digits is 63700992, while the sum is 63.

The spelling of 218468368836 in words is "two hundred eighteen billion, four hundred sixty-eight million, three hundred sixty-eight thousand, eight hundred thirty-six".