18281872817207 has 2 divisors, whose sum is σ = 18281872817208. Its totient is φ = 18281872817206.

The previous prime is 18281872817183. The next prime is 18281872817233. The reversal of 18281872817207 is 70271827818281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18281872817207 - 2⁸ = 18281872816951 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18281872817207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18281872817267) 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, 9140936408603 + 9140936408604.

It is an arithmetic number, because the mean of its divisors is an integer number (9140936408604).

Almost surely, 2^{18281872817207} is an apocalyptic number.

18281872817207 is a deficient number, since it is larger than the sum of its proper divisors (1).

18281872817207 is an equidigital number, since it uses as much as digits as its factorization.

18281872817207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11239424, while the sum is 62.

The spelling of 18281872817207 in words is "eighteen trillion, two hundred eighty-one billion, eight hundred seventy-two million, eight hundred seventeen thousand, two hundred seven".