13115346665 has 4 divisors (see below), whose sum is σ = 15738416004. Its totient is φ = 10492277328.

The previous prime is 13115346661. The next prime is 13115346667. The reversal of 13115346665 is 56664351131.

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 5737911001 + 7377435664 = 75749^2 + 85892^2 .

It is a cyclic number.

It is not a de Polignac number, because 13115346665 - 2² = 13115346661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13115346661) 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, 1311534662 + ... + 1311534671.

It is an arithmetic number, because the mean of its divisors is an integer number (3934604001).

Almost surely, 2^13115346665 is an apocalyptic number.

It is an amenable number.

13115346665 is a deficient number, since it is larger than the sum of its proper divisors (2623069339).

13115346665 is an equidigital number, since it uses as much as digits as its factorization.

13115346665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2623069338.

The product of its digits is 194400, while the sum is 41.

Adding to 13115346665 its reverse (56664351131), we get a palindrome (69779697796).

The spelling of 13115346665 in words is "thirteen billion, one hundred fifteen million, three hundred forty-six thousand, six hundred sixty-five".