1356746665 has 4 divisors (see below), whose sum is σ = 1628096004. Its totient is φ = 1085397328.

The previous prime is 1356746647. The next prime is 1356746687. The reversal of 1356746665 is 5666476531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5666476531 = 229 ⋅24744439.

It can be written as a sum of positive squares in 2 ways, for example, as 416649744 + 940096921 = 20412^2 + 30661^2 .

It is a cyclic number.

It is not a de Polignac number, because 1356746665 - 2¹¹ = 1356744617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 135674662 + ... + 135674671.

It is an arithmetic number, because the mean of its divisors is an integer number (407024001).

Almost surely, 2^1356746665 is an apocalyptic number.

It is an amenable number.

1356746665 is a deficient number, since it is larger than the sum of its proper divisors (271349339).

1356746665 is an equidigital number, since it uses as much as digits as its factorization.

1356746665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271349338.

The product of its digits is 2721600, while the sum is 49.

The square root of 1356746665 is about 36834.0422028319. The cubic root of 1356746665 is about 1107.0474967428.

The spelling of 1356746665 in words is "one billion, three hundred fifty-six million, seven hundred forty-six thousand, six hundred sixty-five".