16218458209 has 2 divisors, whose sum is σ = 16218458210. Its totient is φ = 16218458208.

The previous prime is 16218458189. The next prime is 16218458279. The reversal of 16218458209 is 90285481261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12271100625 + 3947357584 = 110775^2 + 62828^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16218458209 is a prime.

It is not a weakly prime, because it can be changed into another prime (16218458279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8109229104 + 8109229105.

It is an arithmetic number, because the mean of its divisors is an integer number (8109229105).

Almost surely, 2^16218458209 is an apocalyptic number.

It is an amenable number.

16218458209 is a deficient number, since it is larger than the sum of its proper divisors (1).

16218458209 is an equidigital number, since it uses as much as digits as its factorization.

16218458209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 16218458209 in words is "sixteen billion, two hundred eighteen million, four hundred fifty-eight thousand, two hundred nine".