9006001661 has 2 divisors, whose sum is σ = 9006001662. Its totient is φ = 9006001660.

The previous prime is 9006001643. The next prime is 9006001717. The reversal of 9006001661 is 1661006009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6617822500 + 2388179161 = 81350^2 + 48869^2 .

It is a cyclic number.

It is not a de Polignac number, because 9006001661 - 2⁶ = 9006001597 is a prime.

It is a super-2 number, since 2×9006001661² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9006001621) by changing a digit.

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 as a sum of consecutive naturals, namely, 4503000830 + 4503000831.

It is an arithmetic number, because the mean of its divisors is an integer number (4503000831).

Almost surely, 2^9006001661 is an apocalyptic number.

It is an amenable number.

9006001661 is a deficient number, since it is larger than the sum of its proper divisors (1).

9006001661 is an equidigital number, since it uses as much as digits as its factorization.

9006001661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 9006001661 is about 94899.9560642680. The cubic root of 9006001661 is about 2080.5460891261.

The spelling of 9006001661 in words is "nine billion, six million, one thousand, six hundred sixty-one".