18986128943399 has 4 divisors (see below), whose sum is σ = 19053217738536. Its totient is φ = 18919040148264.

The previous prime is 18986128943381. The next prime is 18986128943437. The reversal of 18986128943399 is 99334982168981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18986128943399 - 2⁸ = 18986128943143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18986128942399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33544397144 + ... + 33544397709.

It is an arithmetic number, because the mean of its divisors is an integer number (4763304434634).

Almost surely, 2^{18986128943399} is an apocalyptic number.

18986128943399 is a deficient number, since it is larger than the sum of its proper divisors (67088795137).

18986128943399 is an equidigital number, since it uses as much as digits as its factorization.

18986128943399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67088795136.

The product of its digits is 1451188224, while the sum is 80.

The spelling of 18986128943399 in words is "eighteen trillion, nine hundred eighty-six billion, one hundred twenty-eight million, nine hundred forty-three thousand, three hundred ninety-nine".