18944455318 has 4 divisors (see below), whose sum is σ = 28416682980. Its totient is φ = 9472227658.

The previous prime is 18944455303. The next prime is 18944455331. The reversal of 18944455318 is 81355444981.

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

It is a super-2 number, since 2×18944455318² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4736113828 + ... + 4736113831.

It is an arithmetic number, because the mean of its divisors is an integer number (7104170745).

Almost surely, 2^18944455318 is an apocalyptic number.

18944455318 is a deficient number, since it is larger than the sum of its proper divisors (9472227662).

18944455318 is an equidigital number, since it uses as much as digits as its factorization.

18944455318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9472227661.

The product of its digits is 2764800, while the sum is 52.

The spelling of 18944455318 in words is "eighteen billion, nine hundred forty-four million, four hundred fifty-five thousand, three hundred eighteen".