18312732805 has 16 divisors (see below), whose sum is σ = 23006954880. Its totient is φ = 13974576448.

The previous prime is 18312732799. The next prime is 18312732821. The reversal of 18312732805 is 50823721381.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18312732805 - 2³ = 18312732797 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 748777 + ... + 772846.

It is an arithmetic number, because the mean of its divisors is an integer number (1437934680).

Almost surely, 2^18312732805 is an apocalyptic number.

It is an amenable number.

18312732805 is a deficient number, since it is larger than the sum of its proper divisors (4694222075).

18312732805 is a wasteful number, since it uses less digits than its factorization.

18312732805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521740.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 18312732805 in words is "eighteen billion, three hundred twelve million, seven hundred thirty-two thousand, eight hundred five".