19804160843 has 4 divisors (see below), whose sum is σ = 19809090048. Its totient is φ = 19799231640.

The previous prime is 19804160791. The next prime is 19804160851. The reversal of 19804160843 is 34806140891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34806140891 = 43 ⋅809445137.

It is a cyclic number.

It is not a de Polignac number, because 19804160843 - 2¹² = 19804156747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19804160794 and 19804160803.

It is not an unprimeable number, because it can be changed into a prime (19804160543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2458571 + ... + 2466612.

It is an arithmetic number, because the mean of its divisors is an integer number (4952272512).

Almost surely, 2^19804160843 is an apocalyptic number.

19804160843 is a deficient number, since it is larger than the sum of its proper divisors (4929205).

19804160843 is an equidigital number, since it uses as much as digits as its factorization.

19804160843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4929204.

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 19804160843 in words is "nineteen billion, eight hundred four million, one hundred sixty thousand, eight hundred forty-three".