19609689809 has 16 divisors (see below), whose sum is σ = 20562468864. Its totient is φ = 18678632400.

The previous prime is 19609689787. The next prime is 19609689863. The reversal of 19609689809 is 90898690691.

It is a cyclic number.

It is not a de Polignac number, because 19609689809 - 2²⁰ = 19608641233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19609689509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 683222 + ... + 711344.

It is an arithmetic number, because the mean of its divisors is an integer number (1285154304).

Almost surely, 2^19609689809 is an apocalyptic number.

It is an amenable number.

19609689809 is a deficient number, since it is larger than the sum of its proper divisors (952779055).

19609689809 is a wasteful number, since it uses less digits than its factorization.

19609689809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28508.

The product of its (nonzero) digits is 15116544, while the sum is 65.

The spelling of 19609689809 in words is "nineteen billion, six hundred nine million, six hundred eighty-nine thousand, eight hundred nine".