18365181847 has 2 divisors, whose sum is σ = 18365181848. Its totient is φ = 18365181846.

The previous prime is 18365181817. The next prime is 18365181881. The reversal of 18365181847 is 74818156381.

It is a weak prime.

It is an emirp because it is prime and its reverse (74818156381) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18365181847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18365181794 and 18365181803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18365181817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9182590923 + 9182590924.

It is an arithmetic number, because the mean of its divisors is an integer number (9182590924).

Almost surely, 2^18365181847 is an apocalyptic number.

18365181847 is a deficient number, since it is larger than the sum of its proper divisors (1).

18365181847 is an equidigital number, since it uses as much as digits as its factorization.

18365181847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1290240, while the sum is 52.

The spelling of 18365181847 in words is "eighteen billion, three hundred sixty-five million, one hundred eighty-one thousand, eight hundred forty-seven".