18006632317 has 4 divisors (see below), whose sum is σ = 18587491456. Its totient is φ = 17425773180.

The previous prime is 18006632299. The next prime is 18006632327. The reversal of 18006632317 is 71323660081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71323660081 = 15331 ⋅4652251.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18006632317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18006632327) 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 in 3 ways as a sum of consecutive naturals, for example, 290429523 + ... + 290429584.

It is an arithmetic number, because the mean of its divisors is an integer number (4646872864).

Almost surely, 2^18006632317 is an apocalyptic number.

It is an amenable number.

18006632317 is a deficient number, since it is larger than the sum of its proper divisors (580859139).

18006632317 is an equidigital number, since it uses as much as digits as its factorization.

18006632317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580859138.

The product of its (nonzero) digits is 36288, while the sum is 37.

The spelling of 18006632317 in words is "eighteen billion, six million, six hundred thirty-two thousand, three hundred seventeen".