19985279443 has 8 divisors (see below), whose sum is σ = 20779379280. Its totient is φ = 19198176480.

The previous prime is 19985279359. The next prime is 19985279467. The reversal of 19985279443 is 34497258991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19985279443 is a prime.

It is a super-2 number, since 2×19985279443² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19985279243) 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, 1743393 + ... + 1754818.

It is an arithmetic number, because the mean of its divisors is an integer number (2597422410).

Almost surely, 2^19985279443 is an apocalyptic number.

19985279443 is a deficient number, since it is larger than the sum of its proper divisors (794099837).

19985279443 is a wasteful number, since it uses less digits than its factorization.

19985279443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3498437.

The product of its digits is 19595520, while the sum is 61.

The spelling of 19985279443 in words is "nineteen billion, nine hundred eighty-five million, two hundred seventy-nine thousand, four hundred forty-three".