81229845073 has 16 divisors (see below), whose sum is σ = 91443251200. Its totient is φ = 71644098240.

The previous prime is 81229845071. The next prime is 81229845101. The reversal of 81229845073 is 37054892218.

It is not a de Polignac number, because 81229845073 - 2¹ = 81229845071 is a prime.

It is the 285009-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81229845071) by changing a digit.

It is a nontrivial repunit in base 285008.

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 15 ways as a sum of consecutive naturals, for example, 1243878 + ... + 1307551.

It is an arithmetic number, because the mean of its divisors is an integer number (5715203200).

Almost surely, 2^81229845073 is an apocalyptic number.

It is an amenable number.

81229845073 is a deficient number, since it is larger than the sum of its proper divisors (10213406127).

81229845073 is a wasteful number, since it uses less digits than its factorization.

81229845073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2551552.

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 81229845073 in words is "eighty-one billion, two hundred twenty-nine million, eight hundred forty-five thousand, seventy-three".