218185949847 has 16 divisors (see below), whose sum is σ = 300969318240. Its totient is φ = 140430713472.

The previous prime is 218185949809. The next prime is 218185949867. The reversal of 218185949847 is 748949581812.

It is not a de Polignac number, because 218185949847 - 2⁶ = 218185949783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218185949867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1128153 + ... + 1307325.

It is an arithmetic number, because the mean of its divisors is an integer number (18810582390).

Almost surely, 2^218185949847 is an apocalyptic number.

218185949847 is a deficient number, since it is larger than the sum of its proper divisors (82783368393).

218185949847 is a wasteful number, since it uses less digits than its factorization.

218185949847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193202.

The product of its digits is 46448640, while the sum is 66.

The spelling of 218185949847 in words is "two hundred eighteen billion, one hundred eighty-five million, nine hundred forty-nine thousand, eight hundred forty-seven".