18534647693 has 2 divisors, whose sum is σ = 18534647694. Its totient is φ = 18534647692.

The previous prime is 18534647617. The next prime is 18534647699. The reversal of 18534647693 is 39674643581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11678476489 + 6856171204 = 108067^2 + 82802^2 .

It is an emirp because it is prime and its reverse (39674643581) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18534647693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18534647699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9267323846 + 9267323847.

It is an arithmetic number, because the mean of its divisors is an integer number (9267323847).

Almost surely, 2^18534647693 is an apocalyptic number.

It is an amenable number.

18534647693 is a deficient number, since it is larger than the sum of its proper divisors (1).

18534647693 is an equidigital number, since it uses as much as digits as its factorization.

18534647693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13063680, while the sum is 56.

The spelling of 18534647693 in words is "eighteen billion, five hundred thirty-four million, six hundred forty-seven thousand, six hundred ninety-three".