80129386809 has 72 divisors (see below), whose sum is σ = 127208492320. Its totient is φ = 50391139392.

The previous prime is 80129386769. The next prime is 80129386829. The reversal of 80129386809 is 90868392108.

It is a happy number.

It is not a de Polignac number, because 80129386809 - 2²⁴ = 80112609593 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80129386829) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 9379662 + ... + 9388200.

Almost surely, 2^80129386809 is an apocalyptic number.

It is an amenable number.

80129386809 is a deficient number, since it is larger than the sum of its proper divisors (47079105511).

80129386809 is an equidigital number, since it uses as much as digits as its factorization.

80129386809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8673 (or 8638 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The spelling of 80129386809 in words is "eighty billion, one hundred twenty-nine million, three hundred eighty-six thousand, eight hundred nine".