18744287329 has 4 divisors (see below), whose sum is σ = 19846892484. Its totient is φ = 17641682176.

The previous prime is 18744287311. The next prime is 18744287383. The reversal of 18744287329 is 92378244781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92378244781 = 6907 ⋅13374583.

It can be written as a sum of positive squares in 2 ways, for example, as 10475113104 + 8269174225 = 102348^2 + 90935^2 .

It is a cyclic number.

It is not a de Polignac number, because 18744287329 - 2²¹ = 18742190177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18744287329.

It is not an unprimeable number, because it can be changed into a prime (18744287389) 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, 551302552 + ... + 551302585.

It is an arithmetic number, because the mean of its divisors is an integer number (4961723121).

Almost surely, 2^18744287329 is an apocalyptic number.

It is an amenable number.

18744287329 is a deficient number, since it is larger than the sum of its proper divisors (1102605155).

18744287329 is a wasteful number, since it uses less digits than its factorization.

18744287329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102605154.

The product of its digits is 5419008, while the sum is 55.

The spelling of 18744287329 in words is "eighteen billion, seven hundred forty-four million, two hundred eighty-seven thousand, three hundred twenty-nine".