129808059805 has 4 divisors (see below), whose sum is σ = 155769671772. Its totient is φ = 103846447840.

The previous prime is 129808059803. The next prime is 129808059809. The reversal of 129808059805 is 508950808921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508950808921 = 383 ⋅1328853287.

It can be written as a sum of positive squares in 2 ways, for example, as 25263830916 + 104544228889 = 158946^2 + 323333^2 .

It is not a de Polignac number, because 129808059805 - 2¹ = 129808059803 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 (129808059803) 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, 12980805976 + ... + 12980805985.

It is an arithmetic number, because the mean of its divisors is an integer number (38942417943).

Almost surely, 2^129808059805 is an apocalyptic number.

It is an amenable number.

129808059805 is a deficient number, since it is larger than the sum of its proper divisors (25961611967).

129808059805 is an equidigital number, since it uses as much as digits as its factorization.

129808059805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25961611966.

The product of its (nonzero) digits is 2073600, while the sum is 55.

The spelling of 129808059805 in words is "one hundred twenty-nine billion, eight hundred eight million, fifty-nine thousand, eight hundred five".