218388231469 has 6 divisors (see below), whose sum is σ = 231990266954. Its totient is φ = 205541864640.

The previous prime is 218388231437. The next prime is 218388231511. The reversal of 218388231469 is 964132883812.

It can be written as a sum of positive squares in 3 ways, for example, as 155969704900 + 62418526569 = 394930^2 + 249837^2 .

It is not a de Polignac number, because 218388231469 - 2⁵ = 218388231437 is a prime.

It is a super-2 number, since 2×218388231469² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218388231409) 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 5 ways as a sum of consecutive naturals, for example, 377834022 + ... + 377834599.

Almost surely, 2^218388231469 is an apocalyptic number.

It is an amenable number.

218388231469 is a deficient number, since it is larger than the sum of its proper divisors (13602035485).

218388231469 is an equidigital number, since it uses as much as digits as its factorization.

218388231469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755668655 (or 755668638 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 55.

The spelling of 218388231469 in words is "two hundred eighteen billion, three hundred eighty-eight million, two hundred thirty-one thousand, four hundred sixty-nine".