217685565412 has 24 divisors (see below), whose sum is σ = 437626950656. Its totient is φ = 92810423808.

The previous prime is 217685565389. The next prime is 217685565463. The reversal of 217685565412 is 214565586712.

It is a self number, because there is not a number n which added to its sum of digits gives 217685565412.

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, 20135748 + ... + 20146555.

Almost surely, 2^217685565412 is an apocalyptic number.

It is an amenable number.

217685565412 is an abundant number, since it is smaller than the sum of its proper divisors (219941385244).

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

217685565412 is a wasteful number, since it uses less digits than its factorization.

217685565412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40282507 (or 40282505 counting only the distinct ones).

The product of its digits is 4032000, while the sum is 52.

The spelling of 217685565412 in words is "two hundred seventeen billion, six hundred eighty-five million, five hundred sixty-five thousand, four hundred twelve".