218243342773 has 2 divisors, whose sum is σ = 218243342774. Its totient is φ = 218243342772.

The previous prime is 218243342767. The next prime is 218243342833. The reversal of 218243342773 is 377243342812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156758189329 + 61485153444 = 395927^2 + 247962^2 .

It is a cyclic number.

It is not a de Polignac number, because 218243342773 - 2¹³ = 218243334581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218243342743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109121671386 + 109121671387.

It is an arithmetic number, because the mean of its divisors is an integer number (109121671387).

Almost surely, 2^218243342773 is an apocalyptic number.

It is an amenable number.

218243342773 is a deficient number, since it is larger than the sum of its proper divisors (1).

218243342773 is an equidigital number, since it uses as much as digits as its factorization.

218243342773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1354752, while the sum is 46.

The spelling of 218243342773 in words is "two hundred eighteen billion, two hundred forty-three million, three hundred forty-two thousand, seven hundred seventy-three".