218666360028 has 24 divisors (see below), whose sum is σ = 518869330560. Its totient is φ = 71653383280.

The previous prime is 218666360021. The next prime is 218666360063. The reversal of 218666360028 is 820063666812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218666360021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154424688 + ... + 154426103.

It is an arithmetic number, because the mean of its divisors is an integer number (21619555440).

Almost surely, 2^218666360028 is an apocalyptic number.

It is an amenable number.

218666360028 is an abundant number, since it is smaller than the sum of its proper divisors (300202970532).

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

218666360028 is a wasteful number, since it uses less digits than its factorization.

218666360028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308850857 (or 308850855 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 48.

The spelling of 218666360028 in words is "two hundred eighteen billion, six hundred sixty-six million, three hundred sixty thousand, twenty-eight".