18986128943473 has 2 divisors, whose sum is σ = 18986128943474. Its totient is φ = 18986128943472.

The previous prime is 18986128943443. The next prime is 18986128943539. The reversal of 18986128943473 is 37434982168981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18927433221489 + 58695721984 = 4350567^2 + 242272^2 .

It is a cyclic number.

It is not a de Polignac number, because 18986128943473 - 2³³ = 18977539008881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18986128943396 and 18986128943405.

It is not a weakly prime, because it can be changed into another prime (18986128943443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9493064471736 + 9493064471737.

It is an arithmetic number, because the mean of its divisors is an integer number (9493064471737).

Almost surely, 2^{18986128943473} is an apocalyptic number.

It is an amenable number.

18986128943473 is a deficient number, since it is larger than the sum of its proper divisors (1).

18986128943473 is an equidigital number, since it uses as much as digits as its factorization.

18986128943473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 501645312, while the sum is 73.

The spelling of 18986128943473 in words is "eighteen trillion, nine hundred eighty-six billion, one hundred twenty-eight million, nine hundred forty-three thousand, four hundred seventy-three".