19878966239 has 8 divisors (see below), whose sum is σ = 22827521280. Its totient is φ = 17120640600.

The previous prime is 19878966227. The next prime is 19878966253. The reversal of 19878966239 is 93266987891.

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 19878966239 - 2⁴ = 19878966223 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 (19878966299) 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, 47557127 + ... + 47557544.

It is an arithmetic number, because the mean of its divisors is an integer number (2853440160).

Almost surely, 2^19878966239 is an apocalyptic number.

19878966239 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

19878966239 is a deficient number, since it is larger than the sum of its proper divisors (2948555041).

19878966239 is a wasteful number, since it uses less digits than its factorization.

19878966239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95114701.

The product of its digits is 70543872, while the sum is 68.

The spelling of 19878966239 in words is "nineteen billion, eight hundred seventy-eight million, nine hundred sixty-six thousand, two hundred thirty-nine".