2065666 has 4 divisors (see below), whose sum is σ = 3098502. Its totient is φ = 1032832.

The previous prime is 2065663. The next prime is 2065667. The reversal of 2065666 is 6665602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1901641 + 164025 = 1379^2 + 405^2 .

It is not an unprimeable number, because it can be changed into a prime (2065663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 516415 + ... + 516418.

2^2065666 is an apocalyptic number.

2065666 is a deficient number, since it is larger than the sum of its proper divisors (1032836).

2065666 is a wasteful number, since it uses less digits than its factorization.

2065666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032835.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 2065666 is about 1437.2424986758. The cubic root of 2065666 is about 127.3561828339.

The spelling of 2065666 in words is "two million, sixty-five thousand, six hundred sixty-six".