1718319857409 has 27 divisors (see below), whose sum is σ = 2514287792289. Its totient is φ = 1130841489960.

The previous prime is 1718319857383. The next prime is 1718319857411. The reversal of 1718319857409 is 9047589138171.

The square root of 1718319857409 is 1310847.

It is a perfect power (a square), and thus also a powerful number.

1718319857409 is a `hidden beast` number, since 1 + 71 + 83 + 1 + 9 + 85 + 7 + 409 = 666.

It is not a de Polignac number, because 1718319857409 - 2⁵ = 1718319857377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1718319857609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 310667974 + ... + 310673504.

Almost surely, 2^{1718319857409} is an apocalyptic number.

1718319857409 is the 1310847-th square number.

1718319857409 is the 655424-th centered octagonal number.

It is an amenable number.

1718319857409 is a deficient number, since it is larger than the sum of its proper divisors (795967934880).

1718319857409 is an frugal number, since it uses more digits than its factorization.

1718319857409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11226 (or 5613 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 63.

The spelling of 1718319857409 in words is "one trillion, seven hundred eighteen billion, three hundred nineteen million, eight hundred fifty-seven thousand, four hundred nine".