13172198516509 has 4 divisors (see below), whose sum is σ = 13493471651100. Its totient is φ = 12850925381920.

The previous prime is 13172198516479. The next prime is 13172198516513. The reversal of 13172198516509 is 90561589127131.

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 276939062500 + 12895259454009 = 526250^2 + 3590997^2 .

It is a cyclic number.

It is not a de Polignac number, because 13172198516509 - 2¹³ = 13172198508317 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 (13172198519509) 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, 160636567234 + ... + 160636567315.

It is an arithmetic number, because the mean of its divisors is an integer number (3373367912775).

Almost surely, 2^{13172198516509} is an apocalyptic number.

It is an amenable number.

13172198516509 is a deficient number, since it is larger than the sum of its proper divisors (321273134591).

13172198516509 is an equidigital number, since it uses as much as digits as its factorization.

13172198516509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321273134590.

The product of its (nonzero) digits is 4082400, while the sum is 58.

The spelling of 13172198516509 in words is "thirteen trillion, one hundred seventy-two billion, one hundred ninety-eight million, five hundred sixteen thousand, five hundred nine".