18561316583 has 2 divisors, whose sum is σ = 18561316584. Its totient is φ = 18561316582.

The previous prime is 18561316559. The next prime is 18561316637. The reversal of 18561316583 is 38561316581.

It is a weak prime.

It is an emirp because it is prime and its reverse (38561316581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18561316583 - 2⁸ = 18561316327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18561316523) 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, 9280658291 + 9280658292.

It is an arithmetic number, because the mean of its divisors is an integer number (9280658292).

Almost surely, 2^18561316583 is an apocalyptic number.

18561316583 is a deficient number, since it is larger than the sum of its proper divisors (1).

18561316583 is an equidigital number, since it uses as much as digits as its factorization.

18561316583 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 47.

The spelling of 18561316583 in words is "eighteen billion, five hundred sixty-one million, three hundred sixteen thousand, five hundred eighty-three".