218818821166 has 16 divisors (see below), whose sum is σ = 360438473088. Its totient is φ = 98804403000.

The previous prime is 218818821163. The next prime is 218818821167. The reversal of 218818821166 is 661128818812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218818821163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32931480 + ... + 32938123.

It is an arithmetic number, because the mean of its divisors is an integer number (22527404568).

Almost surely, 2^218818821166 is an apocalyptic number.

218818821166 is a deficient number, since it is larger than the sum of its proper divisors (141619651922).

218818821166 is a wasteful number, since it uses less digits than its factorization.

218818821166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65869767.

The product of its digits is 589824, while the sum is 52.

The spelling of 218818821166 in words is "two hundred eighteen billion, eight hundred eighteen million, eight hundred twenty-one thousand, one hundred sixty-six".