19816669439 has 8 divisors (see below), whose sum is σ = 22733736960. Its totient is φ = 16921130616.

The previous prime is 19816669363. The next prime is 19816669487. The reversal of 19816669439 is 93496661891.

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 19816669439 - 2²⁰ = 19815620863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19816669139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5380199 + ... + 5383880.

It is an arithmetic number, because the mean of its divisors is an integer number (2841717120).

Almost surely, 2^19816669439 is an apocalyptic number.

19816669439 is a deficient number, since it is larger than the sum of its proper divisors (2917067521).

19816669439 is a wasteful number, since it uses less digits than its factorization.

19816669439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10764349.

The product of its digits is 15116544, while the sum is 62.

The spelling of 19816669439 in words is "nineteen billion, eight hundred sixteen million, six hundred sixty-nine thousand, four hundred thirty-nine".