216570066 has 16 divisors (see below), whose sum is σ = 437346624. Its totient is φ = 71488944.

The previous prime is 216570043. The next prime is 216570083. The reversal of 216570066 is 660075612.

216570066 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174601 + ... + 175836.

It is an arithmetic number, because the mean of its divisors is an integer number (27334164).

Almost surely, 2^216570066 is an apocalyptic number.

216570066 is an abundant number, since it is smaller than the sum of its proper divisors (220776558).

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

216570066 is a wasteful number, since it uses less digits than its factorization.

216570066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350545.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 216570066 is about 14716.3197165596. The cubic root of 216570066 is about 600.5273752121.

The spelling of 216570066 in words is "two hundred sixteen million, five hundred seventy thousand, sixty-six".