3666565 has 8 divisors (see below), whose sum is σ = 5028480. Its totient is φ = 2514192.

The previous prime is 3666539. The next prime is 3666581. The reversal of 3666565 is 5656663.

It is a happy number.

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 3666565 - 2¹⁵ = 3633797 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52345 + ... + 52414.

It is an arithmetic number, because the mean of its divisors is an integer number (628560).

Almost surely, 2^3666565 is an apocalyptic number.

3666565 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3666565 is a deficient number, since it is larger than the sum of its proper divisors (1361915).

3666565 is a wasteful number, since it uses less digits than its factorization.

3666565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104771.

The product of its digits is 97200, while the sum is 37.

The square root of 3666565 is about 1914.8276684861. The cubic root of 3666565 is about 154.2007417577.

The spelling of 3666565 in words is "three million, six hundred sixty-six thousand, five hundred sixty-five".