3225601661 has 2 divisors, whose sum is σ = 3225601662. Its totient is φ = 3225601660.

The previous prime is 3225601657. The next prime is 3225601711. The reversal of 3225601661 is 1661065223.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2935580761 + 290020900 = 54181^2 + 17030^2 .

It is a cyclic number.

It is not a de Polignac number, because 3225601661 - 2² = 3225601657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3225601601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1612800830 + 1612800831.

It is an arithmetic number, because the mean of its divisors is an integer number (1612800831).

Almost surely, 2^3225601661 is an apocalyptic number.

It is an amenable number.

3225601661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3225601661 is an equidigital number, since it uses as much as digits as its factorization.

3225601661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 3225601661 is about 56794.3805406838. The cubic root of 3225601661 is about 1477.5320539731.

Adding to 3225601661 its reverse (1661065223), we get a palindrome (4886666884).

The spelling of 3225601661 in words is "three billion, two hundred twenty-five million, six hundred one thousand, six hundred sixty-one".