129998818183205 has 8 divisors (see below), whose sum is σ = 156006384599832. Its totient is φ = 103993852693248.

The previous prime is 129998818183159. The next prime is 129998818183217. The reversal of 129998818183205 is 502381818899921.

It can be written as a sum of positive squares in 4 ways, for example, as 11502348001 + 129987315835204 = 107249^2 + 11401198^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 129998818183205 - 2¹⁶ = 129998818117669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 650121704 + ... + 650321633.

It is an arithmetic number, because the mean of its divisors is an integer number (19500798074979).

Almost surely, 2^{129998818183205} is an apocalyptic number.

It is an amenable number.

129998818183205 is a deficient number, since it is larger than the sum of its proper divisors (26007566416627).

129998818183205 is a wasteful number, since it uses less digits than its factorization.

129998818183205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300463335.

The product of its (nonzero) digits is 179159040, while the sum is 74.

The spelling of 129998818183205 in words is "one hundred twenty-nine trillion, nine hundred ninety-eight billion, eight hundred eighteen million, one hundred eighty-three thousand, two hundred five".