18240135423 has 16 divisors (see below), whose sum is σ = 25163050080. Its totient is φ = 11738797056.

The previous prime is 18240135371. The next prime is 18240135427. The reversal of 18240135423 is 32453104281.

It is not a de Polignac number, because 18240135423 - 2⁶ = 18240135359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18240135427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 641811 + ... + 669627.

It is an arithmetic number, because the mean of its divisors is an integer number (1572690630).

Almost surely, 2^18240135423 is an apocalyptic number.

18240135423 is a deficient number, since it is larger than the sum of its proper divisors (6922914657).

18240135423 is a wasteful number, since it uses less digits than its factorization.

18240135423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35386.

The product of its (nonzero) digits is 23040, while the sum is 33.

The spelling of 18240135423 in words is "eighteen billion, two hundred forty million, one hundred thirty-five thousand, four hundred twenty-three".