3660661 has 8 divisors (see below), whose sum is σ = 3893400. Its totient is φ = 3429888.

The previous prime is 3660653. The next prime is 3660667. The reversal of 3660661 is 1660663.

It can be written as a sum of positive squares in 4 ways, for example, as 442225 + 3218436 = 665^2 + 1794^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3660661 - 2³ = 3660653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3660667) 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, 5625 + ... + 6241.

It is an arithmetic number, because the mean of its divisors is an integer number (486675).

Almost surely, 2^3660661 is an apocalyptic number.

It is an amenable number.

3660661 is a deficient number, since it is larger than the sum of its proper divisors (232739).

3660661 is a wasteful number, since it uses less digits than its factorization.

3660661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 3660661 is about 1913.2853942891. The cubic root of 3660661 is about 154.1179312555.

The spelling of 3660661 in words is "three million, six hundred sixty thousand, six hundred sixty-one".