218043533573 has 4 divisors (see below), whose sum is σ = 225562276140. Its totient is φ = 210524791008.

The previous prime is 218043533557. The next prime is 218043533599. The reversal of 218043533573 is 375335340812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 121715858884 + 96327674689 = 348878^2 + 310367^2 .

It is not a de Polignac number, because 218043533573 - 2⁴ = 218043533557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218043533503) 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, 3759371240 + ... + 3759371297.

It is an arithmetic number, because the mean of its divisors is an integer number (56390569035).

Almost surely, 2^218043533573 is an apocalyptic number.

It is an amenable number.

218043533573 is a deficient number, since it is larger than the sum of its proper divisors (7518742567).

218043533573 is an equidigital number, since it uses as much as digits as its factorization.

218043533573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7518742566.

The product of its (nonzero) digits is 907200, while the sum is 44.

The spelling of 218043533573 in words is "two hundred eighteen billion, forty-three million, five hundred thirty-three thousand, five hundred seventy-three".