16688420068 has 12 divisors (see below), whose sum is σ = 29298043180. Its totient is φ = 8317550592.

The previous prime is 16688420027. The next prime is 16688420087. The reversal of 16688420068 is 86002488661.

16688420068 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 5215439524 + 11472980544 = 72218^2 + 107112^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6663453 + ... + 6665956.

Almost surely, 2^16688420068 is an apocalyptic number.

It is an amenable number.

16688420068 is a deficient number, since it is larger than the sum of its proper divisors (12609623112).

16688420068 is a wasteful number, since it uses less digits than its factorization.

16688420068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13329726 (or 13329724 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 49.

The spelling of 16688420068 in words is "sixteen billion, six hundred eighty-eight million, four hundred twenty thousand, sixty-eight".