80715439681 has 4 divisors (see below), whose sum is σ = 80745593812. Its totient is φ = 80685285552.

The previous prime is 80715439633. The next prime is 80715439711. The reversal of 80715439681 is 18693451708.

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 2851560000 + 77863879681 = 53400^2 + 279041^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80715439681 is a prime.

It is a super-2 number, since 2×80715439681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80715439601) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 15073050 + ... + 15078403.

It is an arithmetic number, because the mean of its divisors is an integer number (20186398453).

Almost surely, 2^80715439681 is an apocalyptic number.

It is an amenable number.

80715439681 is a deficient number, since it is larger than the sum of its proper divisors (30154131).

80715439681 is a wasteful number, since it uses less digits than its factorization.

80715439681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30154130.

The product of its (nonzero) digits is 1451520, while the sum is 52.

The spelling of 80715439681 in words is "eighty billion, seven hundred fifteen million, four hundred thirty-nine thousand, six hundred eighty-one".