3200565661 has 4 divisors (see below), whose sum is σ = 3200982300. Its totient is φ = 3200149024.

The previous prime is 3200565653. The next prime is 3200565671. The reversal of 3200565661 is 1665650023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1665650023 = 193 ⋅8630311.

It can be written as a sum of positive squares in 2 ways, for example, as 176225625 + 3024340036 = 13275^2 + 54994^2 .

It is a cyclic number.

It is not a de Polignac number, because 3200565661 - 2³ = 3200565653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3200565671) 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 3 ways as a sum of consecutive naturals, for example, 196576 + ... + 212233.

It is an arithmetic number, because the mean of its divisors is an integer number (800245575).

Almost surely, 2^3200565661 is an apocalyptic number.

It is an amenable number.

3200565661 is a deficient number, since it is larger than the sum of its proper divisors (416639).

3200565661 is an equidigital number, since it uses as much as digits as its factorization.

3200565661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416638.

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

The square root of 3200565661 is about 56573.5420581035. The cubic root of 3200565661 is about 1473.6994240463.

The spelling of 3200565661 in words is "three billion, two hundred million, five hundred sixty-five thousand, six hundred sixty-one".