218243764636 has 48 divisors (see below), whose sum is σ = 422275182336. Its totient is φ = 98167756544.

The previous prime is 218243764597. The next prime is 218243764643. The reversal of 218243764636 is 636467342812.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2182935 + ... + 2280721.

It is an arithmetic number, because the mean of its divisors is an integer number (8797399632).

Almost surely, 2^218243764636 is an apocalyptic number.

It is an amenable number.

218243764636 is a deficient number, since it is larger than the sum of its proper divisors (204031417700).

218243764636 is a wasteful number, since it uses less digits than its factorization.

218243764636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99258 (or 99256 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 52.

The spelling of 218243764636 in words is "two hundred eighteen billion, two hundred forty-three million, seven hundred sixty-four thousand, six hundred thirty-six".