2066128861 has 2 divisors, whose sum is σ = 2066128862. Its totient is φ = 2066128860.

The previous prime is 2066128849. The next prime is 2066128901. The reversal of 2066128861 is 1688216602.

It is an a-pointer prime, because the next prime (2066128901) can be obtained adding 2066128861 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1399508100 + 666620761 = 37410^2 + 25819^2 .

It is a cyclic number.

It is not a de Polignac number, because 2066128861 - 2⁵ = 2066128829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2066129861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1033064430 + 1033064431.

It is an arithmetic number, because the mean of its divisors is an integer number (1033064431).

Almost surely, 2^2066128861 is an apocalyptic number.

It is an amenable number.

2066128861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2066128861 is an equidigital number, since it uses as much as digits as its factorization.

2066128861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 2066128861 is about 45454.6901980423. The cubic root of 2066128861 is about 1273.6569450520.

The spelling of 2066128861 in words is "two billion, sixty-six million, one hundred twenty-eight thousand, eight hundred sixty-one".