18434323573 has 4 divisors (see below), whose sum is σ = 18438108300. Its totient is φ = 18430538848.

The previous prime is 18434323547. The next prime is 18434323577. The reversal of 18434323573 is 37532343481.

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 1818340164 + 16615983409 = 42642^2 + 128903^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18434323573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18434323577) by changing a digit.

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, 1885048 + ... + 1894801.

It is an arithmetic number, because the mean of its divisors is an integer number (4609527075).

Almost surely, 2^18434323573 is an apocalyptic number.

It is an amenable number.

18434323573 is a deficient number, since it is larger than the sum of its proper divisors (3784727).

18434323573 is an equidigital number, since it uses as much as digits as its factorization.

18434323573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3784726.

The product of its digits is 725760, while the sum is 43.

The spelling of 18434323573 in words is "eighteen billion, four hundred thirty-four million, three hundred twenty-three thousand, five hundred seventy-three".