218449944773 has 2 divisors, whose sum is σ = 218449944774. Its totient is φ = 218449944772.

The previous prime is 218449944761. The next prime is 218449944863. The reversal of 218449944773 is 377449944812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213178894369 + 5271050404 = 461713^2 + 72602^2 .

It is a cyclic number.

It is not a de Polignac number, because 218449944773 - 2²² = 218445750469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218449944703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109224972386 + 109224972387.

It is an arithmetic number, because the mean of its divisors is an integer number (109224972387).

Almost surely, 2^218449944773 is an apocalyptic number.

It is an amenable number.

218449944773 is a deficient number, since it is larger than the sum of its proper divisors (1).

218449944773 is an equidigital number, since it uses as much as digits as its factorization.

218449944773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48771072, while the sum is 62.

The spelling of 218449944773 in words is "two hundred eighteen billion, four hundred forty-nine million, nine hundred forty-four thousand, seven hundred seventy-three".