68217646842 has 12 divisors (see below), whose sum is σ = 147804901530. Its totient is φ = 22739215608.

The previous prime is 68217646841. The next prime is 68217646891. The reversal of 68217646842 is 24864671286.

It is a happy number.

68217646842 is a `hidden beast` number, since 6 + 8 + 2 + 176 + 468 + 4 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 67875359841 + 342287001 = 260529^2 + 18501^2 .

It is not an unprimeable number, because it can be changed into a prime (68217646841) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1894934617 + ... + 1894934652.

Almost surely, 2^68217646842 is an apocalyptic number.

68217646842 is an abundant number, since it is smaller than the sum of its proper divisors (79587254688).

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

68217646842 is a wasteful number, since it uses less digits than its factorization.

68217646842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3789869277 (or 3789869274 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 54.

The spelling of 68217646842 in words is "sixty-eight billion, two hundred seventeen million, six hundred forty-six thousand, eight hundred forty-two".