218678563658 has 16 divisors (see below), whose sum is σ = 333690430464. Its totient is φ = 107464512960.

The previous prime is 218678563639. The next prime is 218678563669. The reversal of 218678563658 is 856365876812.

It is a junction number, because it is equal to n+sod(n) for n = 218678563594 and 218678563603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3995903 + ... + 4050258.

It is an arithmetic number, because the mean of its divisors is an integer number (20855651904).

Almost surely, 2^218678563658 is an apocalyptic number.

218678563658 is a deficient number, since it is larger than the sum of its proper divisors (115011866806).

218678563658 is a wasteful number, since it uses less digits than its factorization.

218678563658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8046397.

The product of its digits is 116121600, while the sum is 65.

The spelling of 218678563658 in words is "two hundred eighteen billion, six hundred seventy-eight million, five hundred sixty-three thousand, six hundred fifty-eight".