3656666 has 16 divisors (see below), whose sum is σ = 6255144. Its totient is φ = 1588224.

The previous prime is 3656663. The next prime is 3656669. The reversal of 3656666 is 6666563.

It is an interprime number because it is at equal distance from previous prime (3656663) and next prime (3656669).

It can be written as a sum of positive squares in 4 ways, for example, as 3330625 + 326041 = 1825^2 + 571^2 .

It is a d-powerful number, because it can be written as 3⁸ + 6² + 5⁵ + 6⁵ + 6⁷ + 6⁸ + 6⁸ .

It is not an unprimeable number, because it can be changed into a prime (3656663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3695 + ... + 4578.

Almost surely, 2^3656666 is an apocalyptic number.

3656666 is a deficient number, since it is larger than the sum of its proper divisors (2598478).

3656666 is a wasteful number, since it uses less digits than its factorization.

3656666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8305.

The product of its digits is 116640, while the sum is 38.

The square root of 3656666 is about 1912.2410935863. The cubic root of 3656666 is about 154.0618461887.

The spelling of 3656666 in words is "three million, six hundred fifty-six thousand, six hundred sixty-six".