18240123107 has 4 divisors (see below), whose sum is σ = 18243760896. Its totient is φ = 18236485320.

The previous prime is 18240123061. The next prime is 18240123133. The reversal of 18240123107 is 70132104281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70132104281 = 50833 ⋅1379657.

It is a cyclic number.

It is not a de Polignac number, because 18240123107 - 2⁶ = 18240123043 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18240123107.

It is not an unprimeable number, because it can be changed into a prime (18240123607) 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, 1811363 + ... + 1821404.

It is an arithmetic number, because the mean of its divisors is an integer number (4560940224).

Almost surely, 2^18240123107 is an apocalyptic number.

18240123107 is a deficient number, since it is larger than the sum of its proper divisors (3637789).

18240123107 is an equidigital number, since it uses as much as digits as its factorization.

18240123107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3637788.

The product of its (nonzero) digits is 2688, while the sum is 29.

Adding to 18240123107 its sum of digits (29), we get a square (18240123136 = 135056²).

Adding to 18240123107 its reverse (70132104281), we get a palindrome (88372227388).

The spelling of 18240123107 in words is "eighteen billion, two hundred forty million, one hundred twenty-three thousand, one hundred seven".