80729288641 has 3 divisors (see below), whose sum is σ = 80729572771. Its totient is φ = 80729004512.

The previous prime is 80729288639. The next prime is 80729288659. The reversal of 80729288641 is 14688292708.

It is a happy number.

The square root of 80729288641 is 284129.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 73619426241 + 7109862400 = 271329^2 + 84320^2 .

It is not a de Polignac number, because 80729288641 - 2¹ = 80729288639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80729288671) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 142065 + ... + 426193.

Almost surely, 2^80729288641 is an apocalyptic number.

80729288641 is the 284129-th square number.

80729288641 is the 142065-th centered octagonal number.

It is an amenable number.

80729288641 is a deficient number, since it is larger than the sum of its proper divisors (284130).

80729288641 is an frugal number, since it uses more digits than its factorization.

80729288641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568258 (or 284129 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 55.

It can be divided in two parts, 80729 and 288641, that added together give a triangular number (369370 = T₈₅₉).

The spelling of 80729288641 in words is "eighty billion, seven hundred twenty-nine million, two hundred eighty-eight thousand, six hundred forty-one".