2009160661 has 2 divisors, whose sum is σ = 2009160662. Its totient is φ = 2009160660.

The previous prime is 2009160649. The next prime is 2009160697. The reversal of 2009160661 is 1660619002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1613548561 + 395612100 = 40169^2 + 19890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2009160661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2009160641) 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, 1004580330 + 1004580331.

It is an arithmetic number, because the mean of its divisors is an integer number (1004580331).

Almost surely, 2^2009160661 is an apocalyptic number.

It is an amenable number.

2009160661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009160661 is an equidigital number, since it uses as much as digits as its factorization.

2009160661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 2009160661 is about 44823.6618428258. The cubic root of 2009160661 is about 1261.8417386805.

Adding to 2009160661 its reverse (1660619002), we get a palindrome (3669779663).

The spelling of 2009160661 in words is "two billion, nine million, one hundred sixty thousand, six hundred sixty-one".