218886886868 has 48 divisors (see below), whose sum is σ = 416955162960. Its totient is φ = 99938893824.

The previous prime is 218886886849. The next prime is 218886886871. The reversal of 218886886868 is 868688688812.

It can be written as a sum of positive squares in 8 ways, for example, as 38047623364 + 180839263504 = 195058^2 + 425252^2 .

It is a super-2 number, since 2×218886886868² (a number of 23 digits) contains 22 as substring.

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, 13151480 + ... + 13168112.

It is an arithmetic number, because the mean of its divisors is an integer number (8686565895).

Almost surely, 2^218886886868 is an apocalyptic number.

It is an amenable number.

218886886868 is a deficient number, since it is larger than the sum of its proper divisors (198068276092).

218886886868 is a wasteful number, since it uses less digits than its factorization.

218886886868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19356 (or 19354 counting only the distinct ones).

The product of its digits is 905969664, while the sum is 77.

The spelling of 218886886868 in words is "two hundred eighteen billion, eight hundred eighty-six million, eight hundred eighty-six thousand, eight hundred sixty-eight".