18634287431839 has 2 divisors, whose sum is σ = 18634287431840. Its totient is φ = 18634287431838.

The previous prime is 18634287431833. The next prime is 18634287431867. The reversal of 18634287431839 is 93813478243681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18634287431839 - 2⁵ = 18634287431807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18634287431833) 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, 9317143715919 + 9317143715920.

It is an arithmetic number, because the mean of its divisors is an integer number (9317143715920).

Almost surely, 2^{18634287431839} is an apocalyptic number.

18634287431839 is a deficient number, since it is larger than the sum of its proper divisors (1).

18634287431839 is an equidigital number, since it uses as much as digits as its factorization.

18634287431839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 167215104, while the sum is 67.

The spelling of 18634287431839 in words is "eighteen trillion, six hundred thirty-four billion, two hundred eighty-seven million, four hundred thirty-one thousand, eight hundred thirty-nine".