129818673875823 has 4 divisors (see below), whose sum is σ = 173091565167768. Its totient is φ = 86545782583880.

The previous prime is 129818673875783. The next prime is 129818673875887. The reversal of 129818673875823 is 328578376818921.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129818673875823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129818673876823) 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, 21636445645968 + ... + 21636445645973.

It is an arithmetic number, because the mean of its divisors is an integer number (43272891291942).

Almost surely, 2^{129818673875823} is an apocalyptic number.

129818673875823 is a deficient number, since it is larger than the sum of its proper divisors (43272891291945).

129818673875823 is an equidigital number, since it uses as much as digits as its factorization.

129818673875823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43272891291944.

The product of its digits is 1950842880, while the sum is 78.

The spelling of 129818673875823 in words is "one hundred twenty-nine trillion, eight hundred eighteen billion, six hundred seventy-three million, eight hundred seventy-five thousand, eight hundred twenty-three".