19669809409 has 8 divisors (see below), whose sum is σ = 20172573288. Its totient is φ = 19168141440.

The previous prime is 19669809389. The next prime is 19669809431. The reversal of 19669809409 is 90490896691.

It can be written as a sum of positive squares in 4 ways, for example, as 5704478784 + 13965330625 = 75528^2 + 118175^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19669809409 - 2⁵ = 19669809377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19669809449) 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, 237562 + ... + 309475.

It is an arithmetic number, because the mean of its divisors is an integer number (2521571661).

Almost surely, 2^19669809409 is an apocalyptic number.

It is an amenable number.

19669809409 is a deficient number, since it is larger than the sum of its proper divisors (502763879).

19669809409 is an equidigital number, since it uses as much as digits as its factorization.

19669809409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547955.

The product of its (nonzero) digits is 7558272, while the sum is 61.

The spelling of 19669809409 in words is "nineteen billion, six hundred sixty-nine million, eight hundred nine thousand, four hundred nine".