19808318812 has 6 divisors (see below), whose sum is σ = 34664557928. Its totient is φ = 9904159404.

The previous prime is 19808318801. The next prime is 19808318851. The reversal of 19808318812 is 21881380891.

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 as a sum of consecutive naturals, namely, 2476039848 + ... + 2476039855.

Almost surely, 2^19808318812 is an apocalyptic number.

It is an amenable number.

19808318812 is a deficient number, since it is larger than the sum of its proper divisors (14856239116).

19808318812 is a wasteful number, since it uses less digits than its factorization.

19808318812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4952079707 (or 4952079705 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 49.

The spelling of 19808318812 in words is "nineteen billion, eight hundred eight million, three hundred eighteen thousand, eight hundred twelve".