18728985347 has 2 divisors, whose sum is σ = 18728985348. Its totient is φ = 18728985346.

The previous prime is 18728985313. The next prime is 18728985377. The reversal of 18728985347 is 74358982781.

It is a strong prime.

It is an emirp because it is prime and its reverse (74358982781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18728985347 - 2⁸ = 18728985091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18728985347.

It is not a weakly prime, because it can be changed into another prime (18728985377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9364492673 + 9364492674.

It is an arithmetic number, because the mean of its divisors is an integer number (9364492674).

Almost surely, 2^18728985347 is an apocalyptic number.

18728985347 is a deficient number, since it is larger than the sum of its proper divisors (1).

18728985347 is an equidigital number, since it uses as much as digits as its factorization.

18728985347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27095040, while the sum is 62.

The spelling of 18728985347 in words is "eighteen billion, seven hundred twenty-eight million, nine hundred eighty-five thousand, three hundred forty-seven".