19868875849 has 9 divisors (see below), whose sum is σ = 20534998701. Its totient is φ = 19223715660.

The previous prime is 19868875811. The next prime is 19868875907. The reversal of 19868875849 is 94857886891.

The square root of 19868875849 is 140957.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 19868875849 - 2¹⁹ = 19868351561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19868875049) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4367394 + ... + 4371940.

Almost surely, 2^19868875849 is an apocalyptic number.

19868875849 is the 140957-th square number.

19868875849 is the 70479-th centered octagonal number.

It is an amenable number.

19868875849 is a deficient number, since it is larger than the sum of its proper divisors (666122852).

19868875849 is an frugal number, since it uses more digits than its factorization.

19868875849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9156 (or 4578 counting only the distinct ones).

The product of its digits is 278691840, while the sum is 73.

The spelling of 19868875849 in words is "nineteen billion, eight hundred sixty-eight million, eight hundred seventy-five thousand, eight hundred forty-nine".