81744717922 has 16 divisors (see below), whose sum is σ = 140364679680. Its totient is φ = 34975731168.

The previous prime is 81744717913. The next prime is 81744717949. The reversal of 81744717922 is 22971744718.

It is a self number, because there is not a number n which added to its sum of digits gives 81744717922.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4801147 + ... + 4818142.

It is an arithmetic number, because the mean of its divisors is an integer number (8772792480).

Almost surely, 2^81744717922 is an apocalyptic number.

81744717922 is a deficient number, since it is larger than the sum of its proper divisors (58619961758).

81744717922 is a wasteful number, since it uses less digits than its factorization.

81744717922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9619905.

The product of its digits is 1580544, while the sum is 52.

The spelling of 81744717922 in words is "eighty-one billion, seven hundred forty-four million, seven hundred seventeen thousand, nine hundred twenty-two".