163968218 has 8 divisors (see below), whose sum is σ = 248488212. Its totient is φ = 81138816.

The previous prime is 163968199. The next prime is 163968221. The reversal of 163968218 is 812869361.

It can be written as a sum of positive squares in 2 ways, for example, as 153190129 + 10778089 = 12377^2 + 3283^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 422405 + ... + 422792.

Almost surely, 2^163968218 is an apocalyptic number.

163968218 is a deficient number, since it is larger than the sum of its proper divisors (84519994).

163968218 is an equidigital number, since it uses as much as digits as its factorization.

163968218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845296.

The product of its digits is 124416, while the sum is 44.

The square root of 163968218 is about 12805.0075361165. The cubic root of 163968218 is about 547.3350064048.

The spelling of 163968218 in words is "one hundred sixty-three million, nine hundred sixty-eight thousand, two hundred eighteen".