81346235973 has 32 divisors (see below), whose sum is σ = 110931292800. Its totient is φ = 53004347136.

The previous prime is 81346235909. The next prime is 81346236011. The reversal of 81346235973 is 37953264318.

It is not a de Polignac number, because 81346235973 - 2⁶ = 81346235909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81346233973) 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, 81590511 + ... + 81591507.

It is an arithmetic number, because the mean of its divisors is an integer number (3466602900).

Almost surely, 2^81346235973 is an apocalyptic number.

It is an amenable number.

81346235973 is a deficient number, since it is larger than the sum of its proper divisors (29585056827).

81346235973 is a wasteful number, since it uses less digits than its factorization.

81346235973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2501.

The product of its digits is 3265920, while the sum is 51.

The spelling of 81346235973 in words is "eighty-one billion, three hundred forty-six million, two hundred thirty-five thousand, nine hundred seventy-three".