19085535405389 has 4 divisors (see below), whose sum is σ = 19085553811260. Its totient is φ = 19085516999520.

The previous prime is 19085535405373. The next prime is 19085535405397. The reversal of 19085535405389 is 98350453558091.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18353727015625 + 731808389764 = 4284125^2 + 855458^2 .

It is a cyclic number.

It is not a de Polignac number, because 19085535405389 - 2⁴ = 19085535405373 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 (19085535405319) 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, 7548392 + ... + 9754449.

It is an arithmetic number, because the mean of its divisors is an integer number (4771388452815).

Almost surely, 2^{19085535405389} is an apocalyptic number.

It is an amenable number.

19085535405389 is a deficient number, since it is larger than the sum of its proper divisors (18405871).

19085535405389 is a wasteful number, since it uses less digits than its factorization.

19085535405389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18405870.

The product of its (nonzero) digits is 116640000, while the sum is 65.

The spelling of 19085535405389 in words is "nineteen trillion, eighty-five billion, five hundred thirty-five million, four hundred five thousand, three hundred eighty-nine".