216550667 has 4 divisors (see below), whose sum is σ = 221158176. Its totient is φ = 211943160.

The previous prime is 216550651. The next prime is 216550669. The reversal of 216550667 is 766055612.

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

It is a cyclic number.

It is not a de Polignac number, because 216550667 - 2⁴ = 216550651 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216550667.

It is not an unprimeable number, because it can be changed into a prime (216550669) 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 3 ways as a sum of consecutive naturals, for example, 2303684 + ... + 2303777.

It is an arithmetic number, because the mean of its divisors is an integer number (55289544).

Almost surely, 2^216550667 is an apocalyptic number.

216550667 is a deficient number, since it is larger than the sum of its proper divisors (4607509).

216550667 is an equidigital number, since it uses as much as digits as its factorization.

216550667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4607508.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 216550667 is about 14715.6606035883. The cubic root of 216550667 is about 600.5094441738.

The spelling of 216550667 in words is "two hundred sixteen million, five hundred fifty thousand, six hundred sixty-seven".