81704319305 has 16 divisors (see below), whose sum is σ = 112083187584. Its totient is φ = 56010044160.

The previous prime is 81704319253. The next prime is 81704319317. The reversal of 81704319305 is 50391340718.

It is not a de Polignac number, because 81704319305 - 2²⁴ = 81687542089 is a prime.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 201872 + ... + 451841.

It is an arithmetic number, because the mean of its divisors is an integer number (7005199224).

Almost surely, 2^81704319305 is an apocalyptic number.

It is an amenable number.

81704319305 is a deficient number, since it is larger than the sum of its proper divisors (30378868279).

81704319305 is a wasteful number, since it uses less digits than its factorization.

81704319305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657296.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 81704319305 in words is "eighty-one billion, seven hundred four million, three hundred nineteen thousand, three hundred five".