18129628789 has 4 divisors (see below), whose sum is σ = 18251304300. Its totient is φ = 18007953280.

The previous prime is 18129628757. The next prime is 18129628823. The reversal of 18129628789 is 98782692181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98782692181 = 7243 ⋅13638367.

It can be written as a sum of positive squares in 2 ways, for example, as 773674225 + 17355954564 = 27815^2 + 131742^2 .

It is a cyclic number.

It is not a de Polignac number, because 18129628789 - 2⁵ = 18129628757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18129608789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60837532 + ... + 60837829.

It is an arithmetic number, because the mean of its divisors is an integer number (4562826075).

Almost surely, 2^18129628789 is an apocalyptic number.

It is an amenable number.

18129628789 is a deficient number, since it is larger than the sum of its proper divisors (121675511).

18129628789 is a wasteful number, since it uses less digits than its factorization.

18129628789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121675510.

The product of its digits is 6967296, while the sum is 61.

The spelling of 18129628789 in words is "eighteen billion, one hundred twenty-nine million, six hundred twenty-eight thousand, seven hundred eighty-nine".