19643394812 has 12 divisors (see below), whose sum is σ = 35870547216. Its totient is φ = 9394667040.

The previous prime is 19643394791. The next prime is 19643394839. The reversal of 19643394812 is 21849334691.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106757489 + ... + 106757672.

It is an arithmetic number, because the mean of its divisors is an integer number (2989212268).

Almost surely, 2^19643394812 is an apocalyptic number.

It is an amenable number.

19643394812 is a deficient number, since it is larger than the sum of its proper divisors (16227152404).

19643394812 is a wasteful number, since it uses less digits than its factorization.

19643394812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213515188 (or 213515186 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 50.

The spelling of 19643394812 in words is "nineteen billion, six hundred forty-three million, three hundred ninety-four thousand, eight hundred twelve".