18129788123 has 2 divisors, whose sum is σ = 18129788124. Its totient is φ = 18129788122.

The previous prime is 18129788119. The next prime is 18129788177. The reversal of 18129788123 is 32188792181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18129788123 - 2² = 18129788119 is a prime.

It is not a weakly prime, because it can be changed into another prime (18129781123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9064894061 + 9064894062.

It is an arithmetic number, because the mean of its divisors is an integer number (9064894062).

Almost surely, 2^18129788123 is an apocalyptic number.

18129788123 is a deficient number, since it is larger than the sum of its proper divisors (1).

18129788123 is an equidigital number, since it uses as much as digits as its factorization.

18129788123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 50.

The spelling of 18129788123 in words is "eighteen billion, one hundred twenty-nine million, seven hundred eighty-eight thousand, one hundred twenty-three".