18847385399 has 2 divisors, whose sum is σ = 18847385400. Its totient is φ = 18847385398.

The previous prime is 18847385357. The next prime is 18847385411. The reversal of 18847385399 is 99358374881.

It is a strong prime.

It is an emirp because it is prime and its reverse (99358374881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18847385399 - 2³² = 14552418103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18847385309) by changing a digit.

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, 9423692699 + 9423692700.

It is an arithmetic number, because the mean of its divisors is an integer number (9423692700).

Almost surely, 2^18847385399 is an apocalyptic number.

18847385399 is a deficient number, since it is larger than the sum of its proper divisors (1).

18847385399 is an equidigital number, since it uses as much as digits as its factorization.

18847385399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52254720, while the sum is 65.

The spelling of 18847385399 in words is "eighteen billion, eight hundred forty-seven million, three hundred eighty-five thousand, three hundred ninety-nine".