1040666569 has 2 divisors, whose sum is σ = 1040666570. Its totient is φ = 1040666568.

The previous prime is 1040666513. The next prime is 1040666573. The reversal of 1040666569 is 9656660401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 647040969 + 393625600 = 25437^2 + 19840^2 .

It is an emirp because it is prime and its reverse (9656660401) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1040666569 - 2²¹ = 1038569417 is a prime.

It is a super-2 number, since 2×1040666569² = 2165973815668463522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1040666269) 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, 520333284 + 520333285.

It is an arithmetic number, because the mean of its divisors is an integer number (520333285).

Almost surely, 2^1040666569 is an apocalyptic number.

It is an amenable number.

1040666569 is a deficient number, since it is larger than the sum of its proper divisors (1).

1040666569 is an equidigital number, since it uses as much as digits as its factorization.

1040666569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 1040666569 is about 32259.3640513882. The cubic root of 1040666569 is about 1013.3758129290.

The spelling of 1040666569 in words is "one billion, forty million, six hundred sixty-six thousand, five hundred sixty-nine".