18147385717 has 2 divisors, whose sum is σ = 18147385718. Its totient is φ = 18147385716.

The previous prime is 18147385667. The next prime is 18147385721. The reversal of 18147385717 is 71758374181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18000515556 + 146870161 = 134166^2 + 12119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18147385717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18147385117) 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, 9073692858 + 9073692859.

It is an arithmetic number, because the mean of its divisors is an integer number (9073692859).

Almost surely, 2^18147385717 is an apocalyptic number.

It is an amenable number.

18147385717 is a deficient number, since it is larger than the sum of its proper divisors (1).

18147385717 is an equidigital number, since it uses as much as digits as its factorization.

18147385717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1317120, while the sum is 52.

The spelling of 18147385717 in words is "eighteen billion, one hundred forty-seven million, three hundred eighty-five thousand, seven hundred seventeen".