18444939345 has 48 divisors (see below), whose sum is σ = 36558492672. Its totient is φ = 8427369600.

The previous prime is 18444939323. The next prime is 18444939349. The reversal of 18444939345 is 54393944481.

It is not a de Polignac number, because 18444939345 - 2⁹ = 18444938833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18444939291 and 18444939300.

It is not an unprimeable number, because it can be changed into a prime (18444939349) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 599559 + ... + 629571.

It is an arithmetic number, because the mean of its divisors is an integer number (761635264).

Almost surely, 2^18444939345 is an apocalyptic number.

18444939345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18444939345 is a deficient number, since it is larger than the sum of its proper divisors (18113553327).

18444939345 is a wasteful number, since it uses less digits than its factorization.

18444939345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31982 (or 31979 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 54.

The spelling of 18444939345 in words is "eighteen billion, four hundred forty-four million, nine hundred thirty-nine thousand, three hundred forty-five".