19883971449 has 14 divisors (see below), whose sum is σ = 29812320426. Its totient is φ = 13255980480.

The previous prime is 19883971441. The next prime is 19883971451. The reversal of 19883971449 is 94417938891.

19883971449 is a `hidden beast` number, since 1 + 98 + 8 + 39 + 71 + 449 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16684372224 + 3199599225 = 129168^2 + 56565^2 .

It is not a de Polignac number, because 19883971449 - 2³ = 19883971441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19883971441) by changing a digit.

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 13 ways as a sum of consecutive naturals, for example, 13637112 + ... + 13638569.

It is an arithmetic number, because the mean of its divisors is an integer number (2129451459).

Almost surely, 2^19883971449 is an apocalyptic number.

It is an amenable number.

19883971449 is a deficient number, since it is larger than the sum of its proper divisors (9928348977).

19883971449 is an frugal number, since it uses more digits than its factorization.

19883971449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27275699 (or 27275684 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 63.

The spelling of 19883971449 in words is "nineteen billion, eight hundred eighty-three million, nine hundred seventy-one thousand, four hundred forty-nine".