19859950449 has 12 divisors (see below), whose sum is σ = 28718234896. Its totient is φ = 13225363992.

The previous prime is 19859950417. The next prime is 19859950463. The reversal of 19859950449 is 94405995891.

19859950449 is a `hidden beast` number, since 1 + 9 + 85 + 9 + 9 + 504 + 49 = 666.

It is not a de Polignac number, because 19859950449 - 2⁵ = 19859950417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19859954449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1208299 + ... + 1224624.

Almost surely, 2^19859950449 is an apocalyptic number.

It is an amenable number.

19859950449 is a deficient number, since it is larger than the sum of its proper divisors (8858284447).

19859950449 is a wasteful number, since it uses less digits than its factorization.

19859950449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2433836 (or 2433833 counting only the distinct ones).

The product of its (nonzero) digits is 20995200, while the sum is 63.

The spelling of 19859950449 in words is "nineteen billion, eight hundred fifty-nine million, nine hundred fifty thousand, four hundred forty-nine".