18139109638845 has 64 divisors (see below), whose sum is σ = 32265218893824. Its totient is φ = 8641446543360.

The previous prime is 18139109638843. The next prime is 18139109638873. The reversal of 18139109638845 is 54883690193181.

It is not a de Polignac number, because 18139109638845 - 2¹ = 18139109638843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18139109638843) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 114249757 + ... + 114408413.

It is an arithmetic number, because the mean of its divisors is an integer number (504144045216).

Almost surely, 2^{18139109638845} is an apocalyptic number.

18139109638845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18139109638845 is a deficient number, since it is larger than the sum of its proper divisors (14126109254979).

18139109638845 is a wasteful number, since it uses less digits than its factorization.

18139109638845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177622.

The product of its (nonzero) digits is 44789760, while the sum is 66.

The spelling of 18139109638845 in words is "eighteen trillion, one hundred thirty-nine billion, one hundred nine million, six hundred thirty-eight thousand, eight hundred forty-five".