129409497085 has 64 divisors (see below), whose sum is σ = 174728171520. Its totient is φ = 91205326080.

The previous prime is 129409497071. The next prime is 129409497089. The reversal of 129409497085 is 580794904921.

It is not a de Polignac number, because 129409497085 - 2²⁹ = 128872626173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129409497089) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 176547379 + ... + 176548111.

It is an arithmetic number, because the mean of its divisors is an integer number (2730127680).

Almost surely, 2^129409497085 is an apocalyptic number.

It is an amenable number.

129409497085 is a deficient number, since it is larger than the sum of its proper divisors (45318674435).

129409497085 is a wasteful number, since it uses less digits than its factorization.

129409497085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378.

The product of its (nonzero) digits is 6531840, while the sum is 58.

The spelling of 129409497085 in words is "one hundred twenty-nine billion, four hundred nine million, four hundred ninety-seven thousand, eighty-five".