18240123135 has 32 divisors (see below), whose sum is σ = 31439374848. Its totient is φ = 8976827520.

The previous prime is 18240123133. The next prime is 18240123149. The reversal of 18240123135 is 53132104281.

It is a Cunningham number, because it is equal to 135056²-1.

It is not a de Polignac number, because 18240123135 - 2¹ = 18240123133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18240123133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 661780 + ... + 688790.

It is an arithmetic number, because the mean of its divisors is an integer number (982480464).

Almost surely, 2^18240123135 is an apocalyptic number.

18240123135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18240123135 is a deficient number, since it is larger than the sum of its proper divisors (13199251713).

18240123135 is a wasteful number, since it uses less digits than its factorization.

18240123135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30495.

The product of its (nonzero) digits is 5760, while the sum is 30.

The spelling of 18240123135 in words is "eighteen billion, two hundred forty million, one hundred twenty-three thousand, one hundred thirty-five".