216468009 has 12 divisors (see below), whose sum is σ = 322762752. Its totient is φ = 139656600.

The previous prime is 216467981. The next prime is 216468017. The reversal of 216468009 is 900864612.

216468009 is a `hidden beast` number, since 2 + 1 + 646 + 8 + 0 + 0 + 9 = 666.

It is not a de Polignac number, because 216468009 - 2⁸ = 216467753 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216468079) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 387657 + ... + 388214.

It is an arithmetic number, because the mean of its divisors is an integer number (26896896).

Almost surely, 2^216468009 is an apocalyptic number.

It is an amenable number.

216468009 is a deficient number, since it is larger than the sum of its proper divisors (106294743).

216468009 is a wasteful number, since it uses less digits than its factorization.

216468009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775908 (or 775905 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 216468009 is about 14712.8518309674. The cubic root of 216468009 is about 600.4330290679.

The spelling of 216468009 in words is "two hundred sixteen million, four hundred sixty-eight thousand, nine".