81744326106 has 16 divisors (see below), whose sum is σ = 164140004448. Its totient is φ = 27139550000.

The previous prime is 81744326099. The next prime is 81744326119. The reversal of 81744326106 is 60162344718.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27138045 + ... + 27141056.

It is an arithmetic number, because the mean of its divisors is an integer number (10258750278).

Almost surely, 2^81744326106 is an apocalyptic number.

81744326106 is an abundant number, since it is smaller than the sum of its proper divisors (82395678342).

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

81744326106 is a wasteful number, since it uses less digits than its factorization.

81744326106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54279357.

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 81744326106 in words is "eighty-one billion, seven hundred forty-four million, three hundred twenty-six thousand, one hundred six".