81968837811 has 8 divisors (see below), whose sum is σ = 124904895744. Its totient is φ = 46839335880.

The previous prime is 81968837773. The next prime is 81968837833. The reversal of 81968837811 is 11873886918.

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

It is not a de Polignac number, because 81968837811 - 2¹¹ = 81968835763 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (81968837311) 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, 1951638975 + ... + 1951639016.

It is an arithmetic number, because the mean of its divisors is an integer number (15613111968).

Almost surely, 2^81968837811 is an apocalyptic number.

81968837811 is a deficient number, since it is larger than the sum of its proper divisors (42936057933).

81968837811 is a wasteful number, since it uses less digits than its factorization.

81968837811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3903278001.

The product of its digits is 4644864, while the sum is 60.

The spelling of 81968837811 in words is "eighty-one billion, nine hundred sixty-eight million, eight hundred thirty-seven thousand, eight hundred eleven".