18986128943539 has 2 divisors, whose sum is σ = 18986128943540. Its totient is φ = 18986128943538.

The previous prime is 18986128943473. The next prime is 18986128943567. The reversal of 18986128943539 is 93534982168981.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18986128943539 is a prime.

It is not a weakly prime, because it can be changed into another prime (18986128943939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9493064471769 + 9493064471770.

It is an arithmetic number, because the mean of its divisors is an integer number (9493064471770).

Almost surely, 2^{18986128943539} is an apocalyptic number.

18986128943539 is a deficient number, since it is larger than the sum of its proper divisors (1).

18986128943539 is an equidigital number, since it uses as much as digits as its factorization.

18986128943539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 806215680, while the sum is 76.

The spelling of 18986128943539 in words is "eighteen trillion, nine hundred eighty-six billion, one hundred twenty-eight million, nine hundred forty-three thousand, five hundred thirty-nine".