19693841768 has 16 divisors (see below), whose sum is σ = 38199262500. Its totient is φ = 9507371776.

The previous prime is 19693841719. The next prime is 19693841819. The reversal of 19693841768 is 86714839691.

It can be written as a sum of positive squares in 2 ways, for example, as 18736681924 + 957159844 = 136882^2 + 30938^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19693841768.

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, 42443393 + ... + 42443856.

Almost surely, 2^19693841768 is an apocalyptic number.

It is an amenable number.

19693841768 is a deficient number, since it is larger than the sum of its proper divisors (18505420732).

19693841768 is a wasteful number, since it uses less digits than its factorization.

19693841768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84887284 (or 84887280 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 62.

The spelling of 19693841768 in words is "nineteen billion, six hundred ninety-three million, eight hundred forty-one thousand, seven hundred sixty-eight".