19219566609 has 24 divisors (see below), whose sum is σ = 27923672192. Its totient is φ = 12738448800.

The previous prime is 19219566577. The next prime is 19219566637. The reversal of 19219566609 is 90666591291.

It is not a de Polignac number, because 19219566609 - 2⁵ = 19219566577 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19219566689) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1145934 + ... + 1162584.

Almost surely, 2^19219566609 is an apocalyptic number.

It is an amenable number.

19219566609 is a deficient number, since it is larger than the sum of its proper divisors (8704105583).

19219566609 is a wasteful number, since it uses less digits than its factorization.

19219566609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17397 (or 17394 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 54.

The spelling of 19219566609 in words is "nineteen billion, two hundred nineteen million, five hundred sixty-six thousand, six hundred nine".