19805556043 has 8 divisors (see below), whose sum is σ = 24376069088. Its totient is φ = 15670329984.

The previous prime is 19805556037. The next prime is 19805556047. The reversal of 19805556043 is 34065550891.

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 19805556043 - 2⁵ = 19805556011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19805555984 and 19805556002.

It is not an unprimeable number, because it can be changed into a prime (19805556047) 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, 108821646 + ... + 108821827.

It is an arithmetic number, because the mean of its divisors is an integer number (3047008636).

Almost surely, 2^19805556043 is an apocalyptic number.

19805556043 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19805556043 is a deficient number, since it is larger than the sum of its proper divisors (4570513045).

19805556043 is a wasteful number, since it uses less digits than its factorization.

19805556043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217643493.

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 19805556043 in words is "nineteen billion, eight hundred five million, five hundred fifty-six thousand, forty-three".