218522893823 has 4 divisors (see below), whose sum is σ = 235332347208. Its totient is φ = 201713440440.

The previous prime is 218522893733. The next prime is 218522893837. The reversal of 218522893823 is 328398225812.

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

It is a cyclic number.

It is not a de Polignac number, because 218522893823 - 2¹⁰ = 218522892799 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 (218522893873) 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, 8404726673 + ... + 8404726698.

It is an arithmetic number, because the mean of its divisors is an integer number (58833086802).

Almost surely, 2^218522893823 is an apocalyptic number.

218522893823 is a deficient number, since it is larger than the sum of its proper divisors (16809453385).

218522893823 is a wasteful number, since it uses less digits than its factorization.

218522893823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16809453384.

The product of its digits is 3317760, while the sum is 53.

The spelling of 218522893823 in words is "two hundred eighteen billion, five hundred twenty-two million, eight hundred ninety-three thousand, eight hundred twenty-three".