13320565261 has 4 divisors (see below), whose sum is σ = 13320842812. Its totient is φ = 13320287712.

The previous prime is 13320565151. The next prime is 13320565267. The reversal of 13320565261 is 16256502331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5196968100 + 8123597161 = 72090^2 + 90131^2 .

It is a cyclic number.

It is not a de Polignac number, because 13320565261 - 2⁷ = 13320565133 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 (13320565267) 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 in 3 ways as a sum of consecutive naturals, for example, 46200 + ... + 169633.

It is an arithmetic number, because the mean of its divisors is an integer number (3330210703).

Almost surely, 2^13320565261 is an apocalyptic number.

It is an amenable number.

13320565261 is a deficient number, since it is larger than the sum of its proper divisors (277551).

13320565261 is an equidigital number, since it uses as much as digits as its factorization.

13320565261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277550.

The product of its (nonzero) digits is 32400, while the sum is 34.

The spelling of 13320565261 in words is "thirteen billion, three hundred twenty million, five hundred sixty-five thousand, two hundred sixty-one".