18103661633 has 2 divisors, whose sum is σ = 18103661634. Its totient is φ = 18103661632.

The previous prime is 18103661627. The next prime is 18103661683. The reversal of 18103661633 is 33616630181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12470858929 + 5632802704 = 111673^2 + 75052^2 .

It is an emirp because it is prime and its reverse (33616630181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18103661633 - 2²² = 18099467329 is a prime.

It is not a weakly prime, because it can be changed into another prime (18103661623) 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, 9051830816 + 9051830817.

It is an arithmetic number, because the mean of its divisors is an integer number (9051830817).

Almost surely, 2^18103661633 is an apocalyptic number.

It is an amenable number.

18103661633 is a deficient number, since it is larger than the sum of its proper divisors (1).

18103661633 is an equidigital number, since it uses as much as digits as its factorization.

18103661633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 38.

The spelling of 18103661633 in words is "eighteen billion, one hundred three million, six hundred sixty-one thousand, six hundred thirty-three".