13197649982449 has 27 divisors (see below), whose sum is σ = 14133013475979. Its totient is φ = 12322360315440.

The previous prime is 13197649982401. The next prime is 13197649982471. The reversal of 13197649982449 is 94428994679131.

It is a happy number.

The square root of 13197649982449 is 3632857.

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

It can be written as a sum of positive squares in only one way, i.e., 5415045350625 + 7782604631824 = 2327025^2 + 2789732^2 .

It is not a de Polignac number, because 13197649982449 - 2⁹ = 13197649981937 is a prime.

It is a Smith number, since the sum of its digits (76) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13197649982149) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4900722747 + ... + 4900725439.

Almost surely, 2^{13197649982449} is an apocalyptic number.

13197649982449 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

13197649982449 is the 3632857-th square number.

13197649982449 is the 1816429-th centered octagonal number.

It is an amenable number.

13197649982449 is a deficient number, since it is larger than the sum of its proper divisors (935363493530).

13197649982449 is an frugal number, since it uses more digits than its factorization.

13197649982449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5566 (or 2783 counting only the distinct ones).

The product of its digits is 846526464, while the sum is 76.

The spelling of 13197649982449 in words is "thirteen trillion, one hundred ninety-seven billion, six hundred forty-nine million, nine hundred eighty-two thousand, four hundred forty-nine".