1066565657 has 4 divisors (see below), whose sum is σ = 1066917156. Its totient is φ = 1066214160.

The previous prime is 1066565653. The next prime is 1066565659. The reversal of 1066565657 is 7565656601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7565656601 = 8123 ⋅931387.

It can be written as a sum of positive squares in 2 ways, for example, as 1011494416 + 55071241 = 31804^2 + 7421^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066565657 - 2² = 1066565653 is a prime.

It is a super-2 number, since 2×1066565657² = 2275124601383683298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1066565651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171158 + ... + 177279.

It is an arithmetic number, because the mean of its divisors is an integer number (266729289).

Almost surely, 2^1066565657 is an apocalyptic number.

It is an amenable number.

1066565657 is a deficient number, since it is larger than the sum of its proper divisors (351499).

1066565657 is an equidigital number, since it uses as much as digits as its factorization.

1066565657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351498.

The product of its (nonzero) digits is 1134000, while the sum is 47.

The square root of 1066565657 is about 32658.3168121078. The cubic root of 1066565657 is about 1021.7136568982.

The spelling of 1066565657 in words is "one billion, sixty-six million, five hundred sixty-five thousand, six hundred fifty-seven".