129186209923 has 8 divisors (see below), whose sum is σ = 137258709840. Its totient is φ = 121587016480.

The previous prime is 129186209921. The next prime is 129186209947. The reversal of 129186209923 is 329902681921.

It is not a de Polignac number, because 129186209923 - 2¹ = 129186209921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129186209921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13142473 + ... + 13152298.

It is an arithmetic number, because the mean of its divisors is an integer number (17157338730).

Almost surely, 2^129186209923 is an apocalyptic number.

129186209923 is a deficient number, since it is larger than the sum of its proper divisors (8072499917).

129186209923 is an frugal number, since it uses more digits than its factorization.

129186209923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26294822 (or 26294788 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 52.

The spelling of 129186209923 in words is "one hundred twenty-nine billion, one hundred eighty-six million, two hundred nine thousand, nine hundred twenty-three".