2010505661 has 2 divisors, whose sum is σ = 2010505662. Its totient is φ = 2010505660.

The previous prime is 2010505633. The next prime is 2010505669. The reversal of 2010505661 is 1665050102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1981140100 + 29365561 = 44510^2 + 5419^2 .

It is a cyclic number.

It is not a de Polignac number, because 2010505661 - 2¹⁰ = 2010504637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2010505661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2010505669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005252830 + 1005252831.

It is an arithmetic number, because the mean of its divisors is an integer number (1005252831).

Almost surely, 2^2010505661 is an apocalyptic number.

It is an amenable number.

2010505661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2010505661 is an equidigital number, since it uses as much as digits as its factorization.

2010505661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 2010505661 is about 44838.6625692605. The cubic root of 2010505661 is about 1262.1232490307.

Adding to 2010505661 its reverse (1665050102), we get a palindrome (3675555763).

The spelling of 2010505661 in words is "two billion, ten million, five hundred five thousand, six hundred sixty-one".