1066505689 has 2 divisors, whose sum is σ = 1066505690. Its totient is φ = 1066505688.

The previous prime is 1066505683. The next prime is 1066505707. The reversal of 1066505689 is 9865056601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1049241664 + 17264025 = 32392^2 + 4155^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066505689 - 2⁹ = 1066505177 is a prime.

It is a super-2 number, since 2×1066505689² = 2274868769338729442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1066505683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533252844 + 533252845.

It is an arithmetic number, because the mean of its divisors is an integer number (533252845).

Almost surely, 2^1066505689 is an apocalyptic number.

It is an amenable number.

1066505689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066505689 is an equidigital number, since it uses as much as digits as its factorization.

1066505689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 46.

The square root of 1066505689 is about 32657.3986869744. The cubic root of 1066505689 is about 1021.6945078120.

The spelling of 1066505689 in words is "one billion, sixty-six million, five hundred five thousand, six hundred eighty-nine".