4066661 has 2 divisors, whose sum is σ = 4066662. Its totient is φ = 4066660.

The previous prime is 4066619. The next prime is 4066669. The reversal of 4066661 is 1666604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3880900 + 185761 = 1970^2 + 431^2 .

It is a cyclic number.

It is not a de Polignac number, because 4066661 - 2⁶ = 4066597 is a prime.

It is a Chen prime.

It is equal to p₂₈₇₅₆₁ and since 4066661 and 287561 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4066669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2033330 + 2033331.

It is an arithmetic number, because the mean of its divisors is an integer number (2033331).

Almost surely, 2^4066661 is an apocalyptic number.

It is an amenable number.

4066661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4066661 is an equidigital number, since it uses as much as digits as its factorization.

4066661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 4066661 is about 2016.5963899601. The cubic root of 4066661 is about 159.6170660117.

The spelling of 4066661 in words is "four million, sixty-six thousand, six hundred sixty-one".