218393968908 has 12 divisors (see below), whose sum is σ = 509585927480. Its totient is φ = 72797989632.

The previous prime is 218393968907. The next prime is 218393968931. The reversal of 218393968908 is 809869393812.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (66) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (218393968907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9099748693 + ... + 9099748716.

Almost surely, 2^218393968908 is an apocalyptic number.

It is an amenable number.

218393968908 is an abundant number, since it is smaller than the sum of its proper divisors (291191958572).

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

218393968908 is a wasteful number, since it uses less digits than its factorization.

218393968908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18199497416 (or 18199497414 counting only the distinct ones).

The product of its (nonzero) digits is 40310784, while the sum is 66.

The spelling of 218393968908 in words is "two hundred eighteen billion, three hundred ninety-three million, nine hundred sixty-eight thousand, nine hundred eight".