18523138343 has 16 divisors (see below), whose sum is σ = 19459545600. Its totient is φ = 17598034080.

The previous prime is 18523138339. The next prime is 18523138363. The reversal of 18523138343 is 34383132581.

It is a cyclic number.

It is not a de Polignac number, because 18523138343 - 2² = 18523138339 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18523138343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18523138363) 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, 2308208 + ... + 2316218.

It is an arithmetic number, because the mean of its divisors is an integer number (1216221600).

Almost surely, 2^18523138343 is an apocalyptic number.

18523138343 is a deficient number, since it is larger than the sum of its proper divisors (936407257).

18523138343 is a wasteful number, since it uses less digits than its factorization.

18523138343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8702.

The product of its digits is 207360, while the sum is 41.

The spelling of 18523138343 in words is "eighteen billion, five hundred twenty-three million, one hundred thirty-eight thousand, three hundred forty-three".