13239541661 has 2 divisors, whose sum is σ = 13239541662. Its totient is φ = 13239541660.

The previous prime is 13239541643. The next prime is 13239541699. The reversal of 13239541661 is 16614593231.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6723016036 + 6516525625 = 81994^2 + 80725^2 .

It is a cyclic number.

It is not a de Polignac number, because 13239541661 - 2¹⁰ = 13239540637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13239541621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6619770830 + 6619770831.

It is an arithmetic number, because the mean of its divisors is an integer number (6619770831).

Almost surely, 2^13239541661 is an apocalyptic number.

It is an amenable number.

13239541661 is a deficient number, since it is larger than the sum of its proper divisors (1).

13239541661 is an equidigital number, since it uses as much as digits as its factorization.

13239541661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 41.

The spelling of 13239541661 in words is "thirteen billion, two hundred thirty-nine million, five hundred forty-one thousand, six hundred sixty-one".