3665661 has 8 divisors (see below), whose sum is σ = 4897440. Its totient is φ = 2438832.

The previous prime is 3665653. The next prime is 3665677. The reversal of 3665661 is 1665663.

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

It is not a de Polignac number, because 3665661 - 2³ = 3665653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3665261) 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, 1155 + ... + 2943.

It is an arithmetic number, because the mean of its divisors is an integer number (612180).

Almost surely, 2^3665661 is an apocalyptic number.

It is an amenable number.

3665661 is a deficient number, since it is larger than the sum of its proper divisors (1231779).

3665661 is a wasteful number, since it uses less digits than its factorization.

3665661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2475.

The product of its digits is 19440, while the sum is 33.

The square root of 3665661 is about 1914.5916013605. The cubic root of 3665661 is about 154.1880678674.

The spelling of 3665661 in words is "three million, six hundred sixty-five thousand, six hundred sixty-one".