218738420053 has 4 divisors (see below), whose sum is σ = 222865560108. Its totient is φ = 214611280000.

The previous prime is 218738420029. The next prime is 218738420081. The reversal of 218738420053 is 350024837812.

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 188280491569 + 30457928484 = 433913^2 + 174522^2 .

It is a cyclic number.

It is not a de Polignac number, because 218738420053 - 2¹⁷ = 218738288981 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 218738419991 and 218738420009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218738420653) 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, 2063569948 + ... + 2063570053.

It is an arithmetic number, because the mean of its divisors is an integer number (55716390027).

Almost surely, 2^218738420053 is an apocalyptic number.

It is an amenable number.

218738420053 is a deficient number, since it is larger than the sum of its proper divisors (4127140055).

218738420053 is an equidigital number, since it uses as much as digits as its factorization.

218738420053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4127140054.

The product of its (nonzero) digits is 322560, while the sum is 43.

The spelling of 218738420053 in words is "two hundred eighteen billion, seven hundred thirty-eight million, four hundred twenty thousand, fifty-three".