2066544721 has 2 divisors, whose sum is σ = 2066544722. Its totient is φ = 2066544720.

The previous prime is 2066544643. The next prime is 2066544787. The reversal of 2066544721 is 1274456602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2062976400 + 3568321 = 45420^2 + 1889^2 .

It is a cyclic number.

It is not a de Polignac number, because 2066544721 - 2⁷ = 2066544593 is a prime.

It is not a weakly prime, because it can be changed into another prime (2066544121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1033272360 + 1033272361.

It is an arithmetic number, because the mean of its divisors is an integer number (1033272361).

Almost surely, 2^2066544721 is an apocalyptic number.

It is an amenable number.

2066544721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2066544721 is an equidigital number, since it uses as much as digits as its factorization.

2066544721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 2066544721 is about 45459.2644133184. The cubic root of 2066544721 is about 1273.7423910690.

The spelling of 2066544721 in words is "two billion, sixty-six million, five hundred forty-four thousand, seven hundred twenty-one".