19830645668 has 12 divisors (see below), whose sum is σ = 34707706572. Its totient is φ = 9914158080.

The previous prime is 19830645613. The next prime is 19830645671. The reversal of 19830645668 is 86654603891.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6894313024 + 12936332644 = 83032^2 + 113738^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252305 + ... + 321432.

It is an arithmetic number, because the mean of its divisors is an integer number (2892308881).

Almost surely, 2^19830645668 is an apocalyptic number.

It is an amenable number.

19830645668 is a deficient number, since it is larger than the sum of its proper divisors (14877060904).

19830645668 is a wasteful number, since it uses less digits than its factorization.

19830645668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582382 (or 582380 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 56.

The spelling of 19830645668 in words is "nineteen billion, eight hundred thirty million, six hundred forty-five thousand, six hundred sixty-eight".