218552738863778 has 16 divisors (see below), whose sum is σ = 357925617945504. Its totient is φ = 99260525295360.

The previous prime is 218552738863747. The next prime is 218552738863819. The reversal of 218552738863778 is 877368837255812.

218552738863778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×218552738863778³ (a number of 44 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4081409300 + ... + 4081462847.

It is an arithmetic number, because the mean of its divisors is an integer number (22370351121594).

Almost surely, 2^{218552738863778} is an apocalyptic number.

218552738863778 is a deficient number, since it is larger than the sum of its proper divisors (139372879081726).

218552738863778 is a wasteful number, since it uses less digits than its factorization.

218552738863778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8162873377.

The product of its digits is 7586611200, while the sum is 80.

The spelling of 218552738863778 in words is "two hundred eighteen trillion, five hundred fifty-two billion, seven hundred thirty-eight million, eight hundred sixty-three thousand, seven hundred seventy-eight".