19749868012 has 12 divisors (see below), whose sum is σ = 39499736080. Its totient is φ = 8464229136.

The previous prime is 19749867971. The next prime is 19749868043. The reversal of 19749868012 is 21086894791.

It is a happy number.

19749868012 is an admirable number.

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, 352676187 + ... + 352676242.

Almost surely, 2^19749868012 is an apocalyptic number.

It is an amenable number.

19749868012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19749868012 is a wasteful number, since it uses less digits than its factorization.

19749868012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705352440 (or 705352438 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 55.

The spelling of 19749868012 in words is "nineteen billion, seven hundred forty-nine million, eight hundred sixty-eight thousand, twelve".