3665591563 has 4 divisors (see below), whose sum is σ = 3669438888. Its totient is φ = 3661744240.

The previous prime is 3665591557. The next prime is 3665591597. The reversal of 3665591563 is 3651955663.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3665591563 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3665591513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1922233 + ... + 1924138.

It is an arithmetic number, because the mean of its divisors is an integer number (917359722).

Almost surely, 2^3665591563 is an apocalyptic number.

3665591563 is a deficient number, since it is larger than the sum of its proper divisors (3847325).

3665591563 is an equidigital number, since it uses as much as digits as its factorization.

3665591563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3847324.

The product of its digits is 2187000, while the sum is 49.

The square root of 3665591563 is about 60544.1290547647. The cubic root of 3665591563 is about 1541.8709428904.

The spelling of 3665591563 in words is "three billion, six hundred sixty-five million, five hundred ninety-one thousand, five hundred sixty-three".