1315665065 has 36 divisors (see below), whose sum is σ = 1873443852. Its totient is φ = 881084160.

The previous prime is 1315665061. The next prime is 1315665073. The reversal of 1315665065 is 5605665131.

It can be written as a sum of positive squares in 6 ways, for example, as 63425296 + 1252239769 = 7964^2 + 35387^2 .

It is not a de Polignac number, because 1315665065 - 2² = 1315665061 is a prime.

It is a super-2 number, since 2×1315665065² = 3461949126522908450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315665061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3216581 + ... + 3216989.

It is an arithmetic number, because the mean of its divisors is an integer number (52040107).

Almost surely, 2^1315665065 is an apocalyptic number.

It is an amenable number.

1315665065 is a deficient number, since it is larger than the sum of its proper divisors (557778787).

1315665065 is an equidigital number, since it uses as much as digits as its factorization.

1315665065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858 (or 438 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 38.

The square root of 1315665065 is about 36272.0976095952. The cubic root of 1315665065 is about 1095.7591713494.

It can be divided in two parts, 131566 and 5065, that added together give a palindrome (136631).

The spelling of 1315665065 in words is "one billion, three hundred fifteen million, six hundred sixty-five thousand, sixty-five".