80847379708729 has 4 divisors (see below), whose sum is σ = 82819267018740. Its totient is φ = 78875492398720.

The previous prime is 80847379708721. The next prime is 80847379708757. The reversal of 80847379708729 is 92780797374808.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3261636000000 + 77585743708729 = 1806000^2 + 8808277^2 .

It is a cyclic number.

It is not a de Polignac number, because 80847379708729 - 2³ = 80847379708721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80847379708721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 985943654944 + ... + 985943655025.

It is an arithmetic number, because the mean of its divisors is an integer number (20704816754685).

Almost surely, 2^{80847379708729} is an apocalyptic number.

It is an amenable number.

80847379708729 is a deficient number, since it is larger than the sum of its proper divisors (1971887310011).

80847379708729 is a wasteful number, since it uses less digits than its factorization.

80847379708729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1971887310010.

The product of its (nonzero) digits is 2389782528, while the sum is 79.

The spelling of 80847379708729 in words is "eighty trillion, eight hundred forty-seven billion, three hundred seventy-nine million, seven hundred eight thousand, seven hundred twenty-nine".