3663565 has 4 divisors (see below), whose sum is σ = 4396284. Its totient is φ = 2930848.

The previous prime is 3663563. The next prime is 3663577. The reversal of 3663565 is 5653663.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5653663 = 61 ⋅92683.

It can be written as a sum of positive squares in 2 ways, for example, as 1295044 + 2368521 = 1138^2 + 1539^2 .

It is a cyclic number.

It is not a de Polignac number, because 3663565 - 2¹ = 3663563 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3663565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3663563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366352 + ... + 366361.

It is an arithmetic number, because the mean of its divisors is an integer number (1099071).

Almost surely, 2^3663565 is an apocalyptic number.

It is an amenable number.

3663565 is a deficient number, since it is larger than the sum of its proper divisors (732719).

3663565 is an equidigital number, since it uses as much as digits as its factorization.

3663565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732718.

The product of its digits is 48600, while the sum is 34.

The square root of 3663565 is about 1914.0441478712. The cubic root of 3663565 is about 154.1586743686.

It can be divided in two parts, 3663 and 565, that multiplied together give a triangular number (2069595 = T₂₀₃₄).

The spelling of 3663565 in words is "three million, six hundred sixty-three thousand, five hundred sixty-five".