19866673338 has 32 divisors (see below), whose sum is σ = 41469235200. Its totient is φ = 6333025776.

The previous prime is 19866673313. The next prime is 19866673339. The reversal of 19866673338 is 83337666891.

It is not an unprimeable number, because it can be changed into a prime (19866673339) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 866223 + ... + 888861.

It is an arithmetic number, because the mean of its divisors is an integer number (1295913600).

Almost surely, 2^19866673338 is an apocalyptic number.

19866673338 is an abundant number, since it is smaller than the sum of its proper divisors (21602561862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19866673338 is a wasteful number, since it uses less digits than its factorization.

19866673338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29026.

The product of its digits is 23514624, while the sum is 60.

The spelling of 19866673338 in words is "nineteen billion, eight hundred sixty-six million, six hundred seventy-three thousand, three hundred thirty-eight".