2066620609 has 2 divisors, whose sum is σ = 2066620610. Its totient is φ = 2066620608.

The previous prime is 2066620603. The next prime is 2066620627. The reversal of 2066620609 is 9060266602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1951165584 + 115455025 = 44172^2 + 10745^2 .

It is a cyclic number.

It is not a de Polignac number, because 2066620609 - 2⁹ = 2066620097 is a prime.

It is not a weakly prime, because it can be changed into another prime (2066620603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1033310304 + 1033310305.

It is an arithmetic number, because the mean of its divisors is an integer number (1033310305).

Almost surely, 2^2066620609 is an apocalyptic number.

It is an amenable number.

2066620609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2066620609 is an equidigital number, since it uses as much as digits as its factorization.

2066620609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 2066620609 is about 45460.0990870016. The cubic root of 2066620609 is about 1273.7579824050.

The spelling of 2066620609 in words is "two billion, sixty-six million, six hundred twenty thousand, six hundred nine".