216743459209 has 4 divisors (see below), whose sum is σ = 221784004816. Its totient is φ = 211702913604.

The previous prime is 216743459161. The next prime is 216743459239. The reversal of 216743459209 is 902954347612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216743459209 - 2⁷ = 216743459081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216743459239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2520272739 + ... + 2520272824.

It is an arithmetic number, because the mean of its divisors is an integer number (55446001204).

Almost surely, 2^216743459209 is an apocalyptic number.

It is an amenable number.

216743459209 is a deficient number, since it is larger than the sum of its proper divisors (5040545607).

216743459209 is an equidigital number, since it uses as much as digits as its factorization.

216743459209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5040545606.

The product of its (nonzero) digits is 3265920, while the sum is 52.

The spelling of 216743459209 in words is "two hundred sixteen billion, seven hundred forty-three million, four hundred fifty-nine thousand, two hundred nine".