218812814387 has 4 divisors (see below), whose sum is σ = 218839284480. Its totient is φ = 218786344296.

The previous prime is 218812814383. The next prime is 218812814401. The reversal of 218812814387 is 783418218812.

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 218812814387 - 2² = 218812814383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218812814383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13222643 + ... + 13239180.

It is an arithmetic number, because the mean of its divisors is an integer number (54709821120).

Almost surely, 2^218812814387 is an apocalyptic number.

218812814387 is a deficient number, since it is larger than the sum of its proper divisors (26470093).

218812814387 is an equidigital number, since it uses as much as digits as its factorization.

218812814387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26470092.

The product of its digits is 1376256, while the sum is 53.

The spelling of 218812814387 in words is "two hundred eighteen billion, eight hundred twelve million, eight hundred fourteen thousand, three hundred eighty-seven".