3321165665 has 4 divisors (see below), whose sum is σ = 3985398804. Its totient is φ = 2656932528.

The previous prime is 3321165641. The next prime is 3321165671. The reversal of 3321165665 is 5665611233.

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 1364341969 + 1956823696 = 36937^2 + 44236^2 .

It is a cyclic number.

It is not a de Polignac number, because 3321165665 - 2⁸ = 3321165409 is a prime.

It is a super-2 number, since 2×3321165665² = 22060282748749784450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332116562 + ... + 332116571.

It is an arithmetic number, because the mean of its divisors is an integer number (996349701).

Almost surely, 2^3321165665 is an apocalyptic number.

It is an amenable number.

3321165665 is a deficient number, since it is larger than the sum of its proper divisors (664233139).

3321165665 is an equidigital number, since it uses as much as digits as its factorization.

3321165665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664233138.

The product of its digits is 97200, while the sum is 38.

The square root of 3321165665 is about 57629.5554815409. Note that the first 3 decimals coincide. The cubic root of 3321165665 is about 1491.9817578636.

Adding to 3321165665 its reverse (5665611233), we get a palindrome (8986776898).

The spelling of 3321165665 in words is "three billion, three hundred twenty-one million, one hundred sixty-five thousand, six hundred sixty-five".