129992909185 has 8 divisors (see below), whose sum is σ = 156008463336. Its totient is φ = 103983012480.

The previous prime is 129992909183. The next prime is 129992909209. The reversal of 129992909185 is 581909299921.

It can be written as a sum of positive squares in 4 ways, for example, as 9555453504 + 120437455681 = 97752^2 + 347041^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129992909185 - 2¹ = 129992909183 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129992909183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1363644 + ... + 1455853.

It is an arithmetic number, because the mean of its divisors is an integer number (19501057917).

Almost surely, 2^129992909185 is an apocalyptic number.

It is an amenable number.

129992909185 is a deficient number, since it is larger than the sum of its proper divisors (26015554151).

129992909185 is an equidigital number, since it uses as much as digits as its factorization.

129992909185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2828723.

The product of its (nonzero) digits is 9447840, while the sum is 64.

The spelling of 129992909185 in words is "one hundred twenty-nine billion, nine hundred ninety-two million, nine hundred nine thousand, one hundred eighty-five".