18785945247539 has 2 divisors, whose sum is σ = 18785945247540. Its totient is φ = 18785945247538.

The previous prime is 18785945247497. The next prime is 18785945247541. The reversal of 18785945247539 is 93574254958781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18785945247539 - 2³² = 18781650280243 is a prime.

Together with 18785945247541, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18785945247539.

It is not a weakly prime, because it can be changed into another prime (18785945247739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9392972623769 + 9392972623770.

It is an arithmetic number, because the mean of its divisors is an integer number (9392972623770).

Almost surely, 2^{18785945247539} is an apocalyptic number.

18785945247539 is a deficient number, since it is larger than the sum of its proper divisors (1).

18785945247539 is an equidigital number, since it uses as much as digits as its factorization.

18785945247539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192000, while the sum is 77.

The spelling of 18785945247539 in words is "eighteen trillion, seven hundred eighty-five billion, nine hundred forty-five million, two hundred forty-seven thousand, five hundred thirty-nine".