18047143623 has 4 divisors (see below), whose sum is σ = 24062858168. Its totient is φ = 12031429080.

The previous prime is 18047143603. The next prime is 18047143649. The reversal of 18047143623 is 32634174081.

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

It is not a de Polignac number, because 18047143623 - 2⁹ = 18047143111 is a prime.

It is a super-2 number, since 2×18047143623² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18047143603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3007857268 + ... + 3007857273.

It is an arithmetic number, because the mean of its divisors is an integer number (6015714542).

Almost surely, 2^18047143623 is an apocalyptic number.

18047143623 is a deficient number, since it is larger than the sum of its proper divisors (6015714545).

18047143623 is an equidigital number, since it uses as much as digits as its factorization.

18047143623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6015714544.

The product of its (nonzero) digits is 96768, while the sum is 39.

The spelling of 18047143623 in words is "eighteen billion, forty-seven million, one hundred forty-three thousand, six hundred twenty-three".