2065665657 has 12 divisors (see below), whose sum is σ = 3027367280. Its totient is φ = 1251918360.

The previous prime is 2065665653. The next prime is 2065665659. The reversal of 2065665657 is 7565665602.

It is not a de Polignac number, because 2065665657 - 2² = 2065665653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2065665653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2844907 + ... + 2845632.

Almost surely, 2^2065665657 is an apocalyptic number.

It is an amenable number.

2065665657 is a deficient number, since it is larger than the sum of its proper divisors (961701623).

2065665657 is a wasteful number, since it uses less digits than its factorization.

2065665657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5690564 (or 5690553 counting only the distinct ones).

The product of its (nonzero) digits is 2268000, while the sum is 48.

The square root of 2065665657 is about 45449.5946846614. The cubic root of 2065665657 is about 1273.5617578486.

Subtracting 2065665657 from its reverse (7565665602), we obtain a palindrome (5499999945).

The spelling of 2065665657 in words is "two billion, sixty-five million, six hundred sixty-five thousand, six hundred fifty-seven".