1665413305 has 16 divisors (see below), whose sum is σ = 2098278720. Its totient is φ = 1267180992.

The previous prime is 1665413297. The next prime is 1665413311. The reversal of 1665413305 is 5033145661.

It is a cyclic number.

It is not a de Polignac number, because 1665413305 - 2³ = 1665413297 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75999 + ... + 95428.

It is an arithmetic number, because the mean of its divisors is an integer number (131142420).

Almost surely, 2^1665413305 is an apocalyptic number.

It is an amenable number.

1665413305 is a deficient number, since it is larger than the sum of its proper divisors (432865415).

1665413305 is a wasteful number, since it uses less digits than its factorization.

1665413305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171528.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 1665413305 is about 40809.4756766122. The cubic root of 1665413305 is about 1185.3338220498. Note that the first 3 decimals are identical.

Adding to 1665413305 its reverse (5033145661), we get a palindrome (6698558966).

The spelling of 1665413305 in words is "one billion, six hundred sixty-five million, four hundred thirteen thousand, three hundred five".