18533089997 has 2 divisors, whose sum is σ = 18533089998. Its totient is φ = 18533089996.

The previous prime is 18533089933. The next prime is 18533090033. The reversal of 18533089997 is 79998033581.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13222470121 + 5310619876 = 114989^2 + 72874^2 .

It is an emirp because it is prime and its reverse (79998033581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18533089997 - 2⁶ = 18533089933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18533086997) 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, 9266544998 + 9266544999.

It is an arithmetic number, because the mean of its divisors is an integer number (9266544999).

Almost surely, 2^18533089997 is an apocalyptic number.

It is an amenable number.

18533089997 is a deficient number, since it is larger than the sum of its proper divisors (1).

18533089997 is an equidigital number, since it uses as much as digits as its factorization.

18533089997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14696640, while the sum is 62.

The spelling of 18533089997 in words is "eighteen billion, five hundred thirty-three million, eighty-nine thousand, nine hundred ninety-seven".