81729292718 has 64 divisors (see below), whose sum is σ = 141203969280. Its totient is φ = 35235648000.

The previous prime is 81729292681. The next prime is 81729292739.

81729292718 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

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, 2791013 + ... + 2820143.

It is an arithmetic number, because the mean of its divisors is an integer number (2206312020).

Almost surely, 2^81729292718 is an apocalyptic number.

81729292718 is a deficient number, since it is larger than the sum of its proper divisors (59474676562).

81729292718 is a wasteful number, since it uses less digits than its factorization.

81729292718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29313.

The product of its digits is 2032128, while the sum is 56.

The spelling of 81729292718 in words is "eighty-one billion, seven hundred twenty-nine million, two hundred ninety-two thousand, seven hundred eighteen".