1066640009 has 2 divisors, whose sum is σ = 1066640010. Its totient is φ = 1066640008.

The previous prime is 1066639967. The next prime is 1066640017. The reversal of 1066640009 is 9000466601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 826390009 + 240250000 = 28747^2 + 15500^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066640009 - 2⁸ = 1066639753 is a prime.

It is a super-2 number, since 2×1066640009² = 2275441817599040162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1066640209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533320004 + 533320005.

It is an arithmetic number, because the mean of its divisors is an integer number (533320005).

Almost surely, 2^1066640009 is an apocalyptic number.

It is an amenable number.

1066640009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066640009 is an equidigital number, since it uses as much as digits as its factorization.

1066640009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 1066640009 is about 32659.4551240525. The cubic root of 1066640009 is about 1021.7373981116.

The spelling of 1066640009 in words is "one billion, sixty-six million, six hundred forty thousand, nine".