68017421909556 has 96 divisors (see below), whose sum is σ = 204948917376000. Its totient is φ = 19104166916064.

The previous prime is 68017421909531. The next prime is 68017421909573. The reversal of 68017421909556 is 65590912471086.

68017421909556 is a `hidden beast` number, since 6 + 8 + 0 + 1 + 74 + 2 + 1 + 9 + 0 + 9 + 556 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 68017421909493 and 68017421909502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 762414166 + ... + 762503373.

It is an arithmetic number, because the mean of its divisors is an integer number (2134884556000).

Almost surely, 2^{68017421909556} is an apocalyptic number.

It is an amenable number.

68017421909556 is an abundant number, since it is smaller than the sum of its proper divisors (136931495466444).

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

68017421909556 is a wasteful number, since it uses less digits than its factorization.

68017421909556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524917618 (or 1524917610 counting only the distinct ones).

The product of its (nonzero) digits is 32659200, while the sum is 63.

The spelling of 68017421909556 in words is "sixty-eight trillion, seventeen billion, four hundred twenty-one million, nine hundred nine thousand, five hundred fifty-six".