3661565 has 8 divisors (see below), whose sum is σ = 4535808. Its totient is φ = 2834640.

The previous prime is 3661561. The next prime is 3661573. The reversal of 3661565 is 5651663.

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

It is not a de Polignac number, because 3661565 - 2² = 3661561 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 (3661561) 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, 11657 + ... + 11966.

It is an arithmetic number, because the mean of its divisors is an integer number (566976).

Almost surely, 2^3661565 is an apocalyptic number.

It is an amenable number.

3661565 is a deficient number, since it is larger than the sum of its proper divisors (874243).

3661565 is a wasteful number, since it uses less digits than its factorization.

3661565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23659.

The product of its digits is 16200, while the sum is 32.

The square root of 3661565 is about 1913.5216225588. The cubic root of 3661565 is about 154.1306166824.

The spelling of 3661565 in words is "three million, six hundred sixty-one thousand, five hundred sixty-five".