1665663341 has 4 divisors (see below), whose sum is σ = 1665794172. Its totient is φ = 1665532512.

The previous prime is 1665663323. The next prime is 1665663347. The reversal of 1665663341 is 1433665661.

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 804006025 + 861657316 = 28355^2 + 29354^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1665663341 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665663347) 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, 43976 + ... + 72561.

It is an arithmetic number, because the mean of its divisors is an integer number (416448543).

Almost surely, 2^1665663341 is an apocalyptic number.

It is an amenable number.

1665663341 is a deficient number, since it is larger than the sum of its proper divisors (130831).

1665663341 is a wasteful number, since it uses less digits than its factorization.

1665663341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130830.

The product of its digits is 233280, while the sum is 41.

The square root of 1665663341 is about 40812.5390168267. The cubic root of 1665663341 is about 1185.3931389164.

It can be divided in two parts, 16656 and 63341, that added together give a palindrome (79997).

The spelling of 1665663341 in words is "one billion, six hundred sixty-five million, six hundred sixty-three thousand, three hundred forty-one".