18138545342 has 4 divisors (see below), whose sum is σ = 27207818016. Its totient is φ = 9069272670.

The previous prime is 18138545323. The next prime is 18138545363. The reversal of 18138545342 is 24354583181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24354583181 = 1181 ⋅20622001.

It is a junction number, because it is equal to n+sod(n) for n = 18138545293 and 18138545302.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4534636334 + ... + 4534636337.

It is an arithmetic number, because the mean of its divisors is an integer number (6801954504).

Almost surely, 2^18138545342 is an apocalyptic number.

18138545342 is a deficient number, since it is larger than the sum of its proper divisors (9069272674).

18138545342 is an equidigital number, since it uses as much as digits as its factorization.

18138545342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9069272673.

The product of its digits is 460800, while the sum is 44.

The spelling of 18138545342 in words is "eighteen billion, one hundred thirty-eight million, five hundred forty-five thousand, three hundred forty-two".