13198136721245 has 90 divisors (see below), whose sum is σ = 18780401500446. Its totient is φ = 8903577590880.

The previous prime is 13198136721241. The next prime is 13198136721361. The reversal of 13198136721245 is 54212763189131.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10558509376996 + 2639627344249 = 3249386^2 + 1624693^2 .

It is not a de Polignac number, because 13198136721245 - 2² = 13198136721241 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 (13198136721241) by changing a digit.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 28261534502 + ... + 28261534968.

Almost surely, 2^{13198136721245} is an apocalyptic number.

It is an amenable number.

13198136721245 is a deficient number, since it is larger than the sum of its proper divisors (5582264779201).

13198136721245 is an frugal number, since it uses more digits than its factorization.

13198136721245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109 (or 550 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 53.

The spelling of 13198136721245 in words is "thirteen trillion, one hundred ninety-eight billion, one hundred thirty-six million, seven hundred twenty-one thousand, two hundred forty-five".