218930401688 has 16 divisors (see below), whose sum is σ = 418239683280. Its totient is φ = 107399819488.

The previous prime is 218930401687. The next prime is 218930401801. The reversal of 218930401688 is 886104039812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218930401687) 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, 258172220 + ... + 258173067.

It is an arithmetic number, because the mean of its divisors is an integer number (26139980205).

Almost surely, 2^218930401688 is an apocalyptic number.

It is an amenable number.

218930401688 is a deficient number, since it is larger than the sum of its proper divisors (199309281592).

218930401688 is a wasteful number, since it uses less digits than its factorization.

218930401688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516345346 (or 516345342 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 50.

The spelling of 218930401688 in words is "two hundred eighteen billion, nine hundred thirty million, four hundred one thousand, six hundred eighty-eight".