18766235808647 has 2 divisors, whose sum is σ = 18766235808648. Its totient is φ = 18766235808646.

The previous prime is 18766235808631. The next prime is 18766235808773. The reversal of 18766235808647 is 74680853266781.

It is a weak prime.

It is an emirp because it is prime and its reverse (74680853266781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18766235808647 - 2⁴ = 18766235808631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18766235808247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9383117904323 + 9383117904324.

It is an arithmetic number, because the mean of its divisors is an integer number (9383117904324).

Almost surely, 2^{18766235808647} is an apocalyptic number.

18766235808647 is a deficient number, since it is larger than the sum of its proper divisors (1).

18766235808647 is an equidigital number, since it uses as much as digits as its factorization.

18766235808647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 650280960, while the sum is 71.

The spelling of 18766235808647 in words is "eighteen trillion, seven hundred sixty-six billion, two hundred thirty-five million, eight hundred eight thousand, six hundred forty-seven".