129040575385 has 4 divisors (see below), whose sum is σ = 154848690468. Its totient is φ = 103232460304.

The previous prime is 129040575373. The next prime is 129040575413. The reversal of 129040575385 is 583575040921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 98354995456 + 30685579929 = 313616^2 + 175173^2 .

It is a cyclic number.

It is not a de Polignac number, because 129040575385 - 2⁵ = 129040575353 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12904057534 + ... + 12904057543.

It is an arithmetic number, because the mean of its divisors is an integer number (38712172617).

Almost surely, 2^129040575385 is an apocalyptic number.

It is an amenable number.

129040575385 is a deficient number, since it is larger than the sum of its proper divisors (25808115083).

129040575385 is an equidigital number, since it uses as much as digits as its factorization.

129040575385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25808115082.

The product of its (nonzero) digits is 1512000, while the sum is 49.

The spelling of 129040575385 in words is "one hundred twenty-nine billion, forty million, five hundred seventy-five thousand, three hundred eighty-five".