218016668508 has 24 divisors (see below), whose sum is σ = 508868641680. Its totient is φ = 72648925440.

The previous prime is 218016668477. The next prime is 218016668533. The reversal of 218016668508 is 805866610812.

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 7 ways as a sum of consecutive naturals, for example, 2873163 + ... + 2948066.

It is an arithmetic number, because the mean of its divisors is an integer number (21202860070).

Almost surely, 2^218016668508 is an apocalyptic number.

It is an amenable number.

218016668508 is an abundant number, since it is smaller than the sum of its proper divisors (290851973172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218016668508 is a wasteful number, since it uses less digits than its factorization.

218016668508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5824357 (or 5824355 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 51.

The spelling of 218016668508 in words is "two hundred eighteen billion, sixteen million, six hundred sixty-eight thousand, five hundred eight".