18243752717 has 4 divisors (see below), whose sum is σ = 18668026080. Its totient is φ = 17819479356.

The previous prime is 18243752711. The next prime is 18243752729. The reversal of 18243752717 is 71725734281.

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: 71725734281 = 787 ⋅91138163.

It is a cyclic number.

It is not a de Polignac number, because 18243752717 - 2¹⁶ = 18243687181 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 (18243752711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212136617 + ... + 212136702.

It is an arithmetic number, because the mean of its divisors is an integer number (4667006520).

Almost surely, 2^18243752717 is an apocalyptic number.

It is an amenable number.

18243752717 is a deficient number, since it is larger than the sum of its proper divisors (424273363).

18243752717 is an equidigital number, since it uses as much as digits as its factorization.

18243752717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424273362.

The product of its digits is 658560, while the sum is 47.

The spelling of 18243752717 in words is "eighteen billion, two hundred forty-three million, seven hundred fifty-two thousand, seven hundred seventeen".