163821866 has 16 divisors (see below), whose sum is σ = 271789224. Its totient is φ = 73566144.

The previous prime is 163821839. The next prime is 163821871. The reversal of 163821866 is 668128361.

163821866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 102434641 + 61387225 = 10121^2 + 7835^2 .

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, 84185 + ... + 86108.

Almost surely, 2^163821866 is an apocalyptic number.

163821866 is a deficient number, since it is larger than the sum of its proper divisors (107967358).

163821866 is a wasteful number, since it uses less digits than its factorization.

163821866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170345.

The product of its digits is 82944, while the sum is 41.

The square root of 163821866 is about 12799.2916210234. The cubic root of 163821866 is about 547.1721142335.

The spelling of 163821866 in words is "one hundred sixty-three million, eight hundred twenty-one thousand, eight hundred sixty-six".