81343510773 has 16 divisors (see below), whose sum is σ = 124348039296. Its totient is φ = 46333497600.

The previous prime is 81343510757. The next prime is 81343510793. The reversal of 81343510773 is 37701534318.

It is not a de Polignac number, because 81343510773 - 2⁴ = 81343510757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81343510793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6181128 + ... + 6194273.

It is an arithmetic number, because the mean of its divisors is an integer number (7771752456).

Almost surely, 2^81343510773 is an apocalyptic number.

It is an amenable number.

81343510773 is a deficient number, since it is larger than the sum of its proper divisors (43004528523).

81343510773 is a wasteful number, since it uses less digits than its factorization.

81343510773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12375724.

The product of its (nonzero) digits is 211680, while the sum is 42.

The spelling of 81343510773 in words is "eighty-one billion, three hundred forty-three million, five hundred ten thousand, seven hundred seventy-three".