2660411561 has 2 divisors, whose sum is σ = 2660411562. Its totient is φ = 2660411560.

The previous prime is 2660411543. The next prime is 2660411569. The reversal of 2660411561 is 1651140662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2566030336 + 94381225 = 50656^2 + 9715^2 .

It is a cyclic number.

It is not a de Polignac number, because 2660411561 - 2⁶ = 2660411497 is a prime.

It is not a weakly prime, because it can be changed into another prime (2660411569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330205780 + 1330205781.

It is an arithmetic number, because the mean of its divisors is an integer number (1330205781).

Almost surely, 2^2660411561 is an apocalyptic number.

It is an amenable number.

2660411561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2660411561 is an equidigital number, since it uses as much as digits as its factorization.

2660411561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 2660411561 is about 51579.1775913498. The cubic root of 2660411561 is about 1385.6374378140.

The spelling of 2660411561 in words is "two billion, six hundred sixty million, four hundred eleven thousand, five hundred sixty-one".