19719926068 has 6 divisors (see below), whose sum is σ = 34509870626. Its totient is φ = 9859963032.

The previous prime is 19719926041. The next prime is 19719926071. The reversal of 19719926068 is 86062991791.

It can be written as a sum of positive squares in only one way, i.e., 19641461904 + 78464164 = 140148^2 + 8858^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2464990755 + ... + 2464990762.

Almost surely, 2^19719926068 is an apocalyptic number.

It is an amenable number.

19719926068 is a deficient number, since it is larger than the sum of its proper divisors (14789944558).

19719926068 is a wasteful number, since it uses less digits than its factorization.

19719926068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4929981521 (or 4929981519 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 58.

The spelling of 19719926068 in words is "nineteen billion, seven hundred nineteen million, nine hundred twenty-six thousand, sixty-eight".