1316565542065 has 4 divisors (see below), whose sum is σ = 1579878650484. Its totient is φ = 1053252433648.

The previous prime is 1316565542059. The next prime is 1316565542069. The reversal of 1316565542065 is 5602455656131.

It is a happy number.

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 415601987584 + 900963554481 = 644672^2 + 949191^2 .

It is a cyclic number.

It is not a de Polignac number, because 1316565542065 - 2²¹ = 1316563444913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1316565542069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131656554202 + ... + 131656554211.

It is an arithmetic number, because the mean of its divisors is an integer number (394969662621).

Almost surely, 2^{1316565542065} is an apocalyptic number.

It is an amenable number.

1316565542065 is a deficient number, since it is larger than the sum of its proper divisors (263313108419).

1316565542065 is an equidigital number, since it uses as much as digits as its factorization.

1316565542065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263313108418.

The product of its (nonzero) digits is 3240000, while the sum is 49.

The spelling of 1316565542065 in words is "one trillion, three hundred sixteen billion, five hundred sixty-five million, five hundred forty-two thousand, sixty-five".