19689168138 has 16 divisors (see below), whose sum is σ = 39726818496. Its totient is φ = 6504975680.

The previous prime is 19689168131. The next prime is 19689168211. The reversal of 19689168138 is 83186198691.

It is not an unprimeable number, because it can be changed into a prime (19689168131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14519358 + ... + 14520713.

It is an arithmetic number, because the mean of its divisors is an integer number (2482926156).

Almost surely, 2^19689168138 is an apocalyptic number.

19689168138 is an abundant number, since it is smaller than the sum of its proper divisors (20037650358).

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

19689168138 is a wasteful number, since it uses less digits than its factorization.

19689168138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29040189.

The product of its digits is 4478976, while the sum is 60.

The spelling of 19689168138 in words is "nineteen billion, six hundred eighty-nine million, one hundred sixty-eight thousand, one hundred thirty-eight".