19857069968 has 20 divisors (see below), whose sum is σ = 38499596508. Its totient is φ = 9921690240.

The previous prime is 19857069937. The next prime is 19857070001. The reversal of 19857069968 is 86996075891.

It can be written as a sum of positive squares in 2 ways, for example, as 13668415744 + 6188654224 = 116912^2 + 78668^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19857069898 and 19857069907.

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, 403823 + ... + 450318.

Almost surely, 2^19857069968 is an apocalyptic number.

It is an amenable number.

19857069968 is a deficient number, since it is larger than the sum of its proper divisors (18642526540).

19857069968 is a wasteful number, since it uses less digits than its factorization.

19857069968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855602 (or 855596 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 68.

The spelling of 19857069968 in words is "nineteen billion, eight hundred fifty-seven million, sixty-nine thousand, nine hundred sixty-eight".