218839885807 has 4 divisors (see below), whose sum is σ = 218856793680. Its totient is φ = 218822977936.

The previous prime is 218839885787. The next prime is 218839885841. The reversal of 218839885807 is 708588938812.

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 218839885807 - 2¹⁹ = 218839361519 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218839885877) 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, 8434507 + ... + 8460412.

It is an arithmetic number, because the mean of its divisors is an integer number (54714198420).

Almost surely, 2^218839885807 is an apocalyptic number.

218839885807 is a deficient number, since it is larger than the sum of its proper divisors (16907873).

218839885807 is a wasteful number, since it uses less digits than its factorization.

218839885807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16907872.

The product of its (nonzero) digits is 61931520, while the sum is 67.

The spelling of 218839885807 in words is "two hundred eighteen billion, eight hundred thirty-nine million, eight hundred eighty-five thousand, eight hundred seven".