218307666717432 has 48 divisors (see below), whose sum is σ = 591254005600440. Its totient is φ = 72768720712128.

The previous prime is 218307666717379. The next prime is 218307666717461. The reversal of 218307666717432 is 234717666703812.

It is a self number, because there is not a number n which added to its sum of digits gives 218307666717432.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 145003 + ... + 20895845.

Almost surely, 2^{218307666717432} is an apocalyptic number.

It is an amenable number.

218307666717432 is an abundant number, since it is smaller than the sum of its proper divisors (372946338883008).

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

218307666717432 is a wasteful number, since it uses less digits than its factorization.

218307666717432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20896972 (or 20896965 counting only the distinct ones).

The product of its (nonzero) digits is 85349376, while the sum is 63.

The spelling of 218307666717432 in words is "two hundred eighteen trillion, three hundred seven billion, six hundred sixty-six million, seven hundred seventeen thousand, four hundred thirty-two".