13228649168641 has 3 divisors (see below), whose sum is σ = 13228652805763. Its totient is φ = 13228645531520.

The previous prime is 13228649168617. The next prime is 13228649168663. The reversal of 13228649168641 is 14686194682231.

The square root of 13228649168641 is 3637121.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 237238159041 + 12991411009600 = 487071^2 + 3604360^2 .

It is not a de Polignac number, because 13228649168641 - 2⁷ = 13228649168513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13228649168641.

It is not an unprimeable number, because it can be changed into a prime (13228649108641) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1818561 + ... + 5455681.

Almost surely, 2^{13228649168641} is an apocalyptic number.

13228649168641 is the 3637121-st square number.

13228649168641 is the 1818561-st centered octagonal number.

It is an amenable number.

13228649168641 is a deficient number, since it is larger than the sum of its proper divisors (3637122).

13228649168641 is an frugal number, since it uses more digits than its factorization.

13228649168641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7274242 (or 3637121 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 61.

The spelling of 13228649168641 in words is "thirteen trillion, two hundred twenty-eight billion, six hundred forty-nine million, one hundred sixty-eight thousand, six hundred forty-one".