13319125661 has 2 divisors, whose sum is σ = 13319125662. Its totient is φ = 13319125660.

The previous prime is 13319125627. The next prime is 13319125663. The reversal of 13319125661 is 16652191331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10997716900 + 2321408761 = 104870^2 + 48181^2 .

It is a cyclic number.

It is not a de Polignac number, because 13319125661 - 2¹⁴ = 13319109277 is a prime.

It is a Sophie Germain prime.

Together with 13319125663, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13319125663) 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, 6659562830 + 6659562831.

It is an arithmetic number, because the mean of its divisors is an integer number (6659562831).

Almost surely, 2^13319125661 is an apocalyptic number.

It is an amenable number.

13319125661 is a deficient number, since it is larger than the sum of its proper divisors (1).

13319125661 is an equidigital number, since it uses as much as digits as its factorization.

13319125661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 38.

The spelling of 13319125661 in words is "thirteen billion, three hundred nineteen million, one hundred twenty-five thousand, six hundred sixty-one".