80440871641 has 9 divisors (see below), whose sum is σ = 87108605181. Its totient is φ = 74249708832.

The previous prime is 80440871617. The next prime is 80440871647. The reversal of 80440871641 is 14617804408.

It is a happy number.

The square root of 80440871641 is 283621.

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

It can be written as a sum of positive squares in 4 ways, for example, as 3501207241 + 76939664400 = 59171^2 + 277380^2 .

It is not a de Polignac number, because 80440871641 - 2²⁵ = 80407317209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80440871647) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 3676165 + ... + 3697981.

It is an arithmetic number, because the mean of its divisors is an integer number (9678733909).

Almost surely, 2^80440871641 is an apocalyptic number.

80440871641 is the 283621-st square number.

80440871641 is the 141811-st centered octagonal number.

It is an amenable number.

80440871641 is a deficient number, since it is larger than the sum of its proper divisors (6667733540).

80440871641 is an frugal number, since it uses more digits than its factorization.

80440871641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43660 (or 21830 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 43.

The spelling of 80440871641 in words is "eighty billion, four hundred forty million, eight hundred seventy-one thousand, six hundred forty-one".