18044040787 has 4 divisors (see below), whose sum is σ = 18666249120. Its totient is φ = 17421832456.

The previous prime is 18044040779. The next prime is 18044040803. The reversal of 18044040787 is 78704044081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78704044081 = 13 ⋅6054157237.

It is a cyclic number.

It is not a de Polignac number, because 18044040787 - 2³ = 18044040779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18044040757) 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, 311104123 + ... + 311104180.

It is an arithmetic number, because the mean of its divisors is an integer number (4666562280).

Almost surely, 2^18044040787 is an apocalyptic number.

18044040787 is a deficient number, since it is larger than the sum of its proper divisors (622208333).

18044040787 is an equidigital number, since it uses as much as digits as its factorization.

18044040787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622208332.

The product of its (nonzero) digits is 200704, while the sum is 43.

The spelling of 18044040787 in words is "eighteen billion, forty-four million, forty thousand, seven hundred eighty-seven".