18129788149 has 4 divisors (see below), whose sum is σ = 19777950720. Its totient is φ = 16481625580.

The previous prime is 18129788123. The next prime is 18129788177. The reversal of 18129788149 is 94188792181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94188792181 = 11 ⋅8562617471.

It is a cyclic number.

It is not a de Polignac number, because 18129788149 - 2⁷ = 18129788021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18129788093 and 18129788102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18129788119) 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 in 3 ways as a sum of consecutive naturals, for example, 824081269 + ... + 824081290.

It is an arithmetic number, because the mean of its divisors is an integer number (4944487680).

Almost surely, 2^18129788149 is an apocalyptic number.

It is an amenable number.

18129788149 is a deficient number, since it is larger than the sum of its proper divisors (1648162571).

18129788149 is a wasteful number, since it uses less digits than its factorization.

18129788149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648162570.

The product of its digits is 2322432, while the sum is 58.

The spelling of 18129788149 in words is "eighteen billion, one hundred twenty-nine million, seven hundred eighty-eight thousand, one hundred forty-nine".