218236352393 has 4 divisors (see below), whose sum is σ = 221935273680. Its totient is φ = 214537431108.

The previous prime is 218236352363. The next prime is 218236352401. The reversal of 218236352393 is 393253632812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 218236352393 - 2¹⁴ = 218236336009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218236352363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1849460555 + ... + 1849460672.

It is an arithmetic number, because the mean of its divisors is an integer number (55483818420).

Almost surely, 2^218236352393 is an apocalyptic number.

It is an amenable number.

218236352393 is a deficient number, since it is larger than the sum of its proper divisors (3698921287).

218236352393 is an equidigital number, since it uses as much as digits as its factorization.

218236352393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3698921286.

The product of its digits is 1399680, while the sum is 47.

The spelling of 218236352393 in words is "two hundred eighteen billion, two hundred thirty-six million, three hundred fifty-two thousand, three hundred ninety-three".