18423543485 has 4 divisors (see below), whose sum is σ = 22108252188. Its totient is φ = 14738834784.

The previous prime is 18423543451. The next prime is 18423543493. The reversal of 18423543485 is 58434532481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2641651609 + 15781891876 = 51397^2 + 125626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18423543485 is a prime.

It is a Duffinian number.

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 in 3 ways as a sum of consecutive naturals, for example, 1842354344 + ... + 1842354353.

It is an arithmetic number, because the mean of its divisors is an integer number (5527063047).

Almost surely, 2^18423543485 is an apocalyptic number.

It is an amenable number.

18423543485 is a deficient number, since it is larger than the sum of its proper divisors (3684708703).

18423543485 is an equidigital number, since it uses as much as digits as its factorization.

18423543485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3684708702.

The product of its digits is 1843200, while the sum is 47.

The spelling of 18423543485 in words is "eighteen billion, four hundred twenty-three million, five hundred forty-three thousand, four hundred eighty-five".