18811138305 has 8 divisors (see below), whose sum is σ = 30097821312. Its totient is φ = 10032607088.

The previous prime is 18811138301. The next prime is 18811138351. The reversal of 18811138305 is 50383111881.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18811138305 - 2² = 18811138301 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18811138301) 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, 627037929 + ... + 627037958.

It is an arithmetic number, because the mean of its divisors is an integer number (3762227664).

Almost surely, 2^18811138305 is an apocalyptic number.

18811138305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18811138305 is a deficient number, since it is larger than the sum of its proper divisors (11286683007).

18811138305 is a wasteful number, since it uses less digits than its factorization.

18811138305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254075895.

The product of its (nonzero) digits is 23040, while the sum is 39.

The spelling of 18811138305 in words is "eighteen billion, eight hundred eleven million, one hundred thirty-eight thousand, three hundred five".