18516112122125 has 8 divisors (see below), whose sum is σ = 23108107928568. Its totient is φ = 14812889697600.

The previous prime is 18516112122121. The next prime is 18516112122149. The reversal of 18516112122125 is 52122121161581.

It can be written as a sum of positive squares in 4 ways, for example, as 262137856036 + 18253974266089 = 511994^2 + 4272467^2 .

It is not a de Polignac number, because 18516112122125 - 2² = 18516112122121 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 (18516112122121) 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 7 ways as a sum of consecutive naturals, for example, 74064448364 + ... + 74064448613.

It is an arithmetic number, because the mean of its divisors is an integer number (2888513491071).

Almost surely, 2^{18516112122125} is an apocalyptic number.

It is an amenable number.

18516112122125 is a deficient number, since it is larger than the sum of its proper divisors (4591995806443).

18516112122125 is an equidigital number, since it uses as much as digits as its factorization.

18516112122125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148128896992 (or 148128896982 counting only the distinct ones).

The product of its digits is 19200, while the sum is 38.

The spelling of 18516112122125 in words is "eighteen trillion, five hundred sixteen billion, one hundred twelve million, one hundred twenty-two thousand, one hundred twenty-five".