218966849789 has 2 divisors, whose sum is σ = 218966849790. Its totient is φ = 218966849788.

The previous prime is 218966849753. The next prime is 218966849797. The reversal of 218966849789 is 987948669812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140711263225 + 78255586564 = 375115^2 + 279742^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218966849789 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218966849749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109483424894 + 109483424895.

It is an arithmetic number, because the mean of its divisors is an integer number (109483424895).

Almost surely, 2^218966849789 is an apocalyptic number.

It is an amenable number.

218966849789 is a deficient number, since it is larger than the sum of its proper divisors (1).

218966849789 is an equidigital number, since it uses as much as digits as its factorization.

218966849789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 752467968, while the sum is 77.

The spelling of 218966849789 in words is "two hundred eighteen billion, nine hundred sixty-six million, eight hundred forty-nine thousand, seven hundred eighty-nine".