19681569843 has 32 divisors (see below), whose sum is σ = 29770540800. Its totient is φ = 11465629056.

The previous prime is 19681569841. The next prime is 19681569847. The reversal of 19681569843 is 34896518691.

It is not a de Polignac number, because 19681569843 - 2¹ = 19681569841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19681569841) 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 31 ways as a sum of consecutive naturals, for example, 1049596 + ... + 1068182.

It is an arithmetic number, because the mean of its divisors is an integer number (930329400).

Almost surely, 2^19681569843 is an apocalyptic number.

19681569843 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19681569843 is a deficient number, since it is larger than the sum of its proper divisors (10088970957).

19681569843 is a wasteful number, since it uses less digits than its factorization.

19681569843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20051.

The product of its digits is 11197440, while the sum is 60.

The spelling of 19681569843 in words is "nineteen billion, six hundred eighty-one million, five hundred sixty-nine thousand, eight hundred forty-three".