81835197056 has 64 divisors (see below), whose sum is σ = 167370053760. Its totient is φ = 39832934400.

The previous prime is 81835197019. The next prime is 81835197079. The reversal of 81835197056 is 65079153818.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 81835196989 and 81835197007.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2434121 + ... + 2467511.

It is an arithmetic number, because the mean of its divisors is an integer number (2615157090).

Almost surely, 2^81835197056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81835197056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83685026880).

81835197056 is an abundant number, since it is smaller than the sum of its proper divisors (85534856704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81835197056 is a wasteful number, since it uses less digits than its factorization.

81835197056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33913 (or 33901 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 53.

The spelling of 81835197056 in words is "eighty-one billion, eight hundred thirty-five million, one hundred ninety-seven thousand, fifty-six".