19949888066 has 16 divisors (see below), whose sum is σ = 30205440000. Its totient is φ = 9881500608.

The previous prime is 19949888039. The next prime is 19949888089. The reversal of 19949888066 is 66088894991.

It is a junction number, because it is equal to n+sod(n) for n = 19949887987 and 19949888005.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 429695 + ... + 473853.

It is an arithmetic number, because the mean of its divisors is an integer number (1887840000).

Almost surely, 2^19949888066 is an apocalyptic number.

19949888066 is a deficient number, since it is larger than the sum of its proper divisors (10255551934).

19949888066 is a wasteful number, since it uses less digits than its factorization.

19949888066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46273.

The product of its (nonzero) digits is 53747712, while the sum is 68.

The spelling of 19949888066 in words is "nineteen billion, nine hundred forty-nine million, eight hundred eighty-eight thousand, sixty-six".