18744447443 has 2 divisors, whose sum is σ = 18744447444. Its totient is φ = 18744447442.

The previous prime is 18744447439. The next prime is 18744447467. The reversal of 18744447443 is 34474444781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18744447443 - 2² = 18744447439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18744447391 and 18744447400.

It is not a weakly prime, because it can be changed into another prime (18744447343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9372223721 + 9372223722.

It is an arithmetic number, because the mean of its divisors is an integer number (9372223722).

Almost surely, 2^18744447443 is an apocalyptic number.

18744447443 is a deficient number, since it is larger than the sum of its proper divisors (1).

18744447443 is an equidigital number, since it uses as much as digits as its factorization.

18744447443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4816896, while the sum is 50.

The spelling of 18744447443 in words is "eighteen billion, seven hundred forty-four million, four hundred forty-seven thousand, four hundred forty-three".