163566668218 has 4 divisors (see below), whose sum is σ = 245350002330. Its totient is φ = 81783334108.

The previous prime is 163566668159. The next prime is 163566668267. The reversal of 163566668218 is 812866665361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 160466739889 + 3099928329 = 400583^2 + 55677^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40891667053 + ... + 40891667056.

Almost surely, 2^163566668218 is an apocalyptic number.

163566668218 is a deficient number, since it is larger than the sum of its proper divisors (81783334112).

163566668218 is an equidigital number, since it uses as much as digits as its factorization.

163566668218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81783334111.

The product of its digits is 14929920, while the sum is 58.

The spelling of 163566668218 in words is "one hundred sixty-three billion, five hundred sixty-six million, six hundred sixty-eight thousand, two hundred eighteen".