13135668365665 has 4 divisors (see below), whose sum is σ = 15762802038804. Its totient is φ = 10508534692528.

The previous prime is 13135668365657. The next prime is 13135668365689. The reversal of 13135668365665 is 56656386653131.

13135668365665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1420539794496 + 11715128571169 = 1191864^2 + 3422737^2 .

It is a cyclic number.

It is not a de Polignac number, because 13135668365665 - 2³ = 13135668365657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13135668365597 and 13135668365606.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1313566836562 + ... + 1313566836571.

It is an arithmetic number, because the mean of its divisors is an integer number (3940700509701).

Almost surely, 2^{13135668365665} is an apocalyptic number.

It is an amenable number.

13135668365665 is a deficient number, since it is larger than the sum of its proper divisors (2627133673139).

13135668365665 is an equidigital number, since it uses as much as digits as its factorization.

13135668365665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2627133673138.

The product of its digits is 209952000, while the sum is 64.

The spelling of 13135668365665 in words is "thirteen trillion, one hundred thirty-five billion, six hundred sixty-eight million, three hundred sixty-five thousand, six hundred sixty-five".