3663520561 has 4 divisors (see below), whose sum is σ = 3664966000. Its totient is φ = 3662075124.

The previous prime is 3663520543. The next prime is 3663520589. The reversal of 3663520561 is 1650253663.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1650253663 = 2833 ⋅582511.

It is a cyclic number.

It is not a de Polignac number, because 3663520561 - 2⁷ = 3663520433 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 3663520561.

It is not an unprimeable number, because it can be changed into a prime (3663520501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 718911 + ... + 723988.

It is an arithmetic number, because the mean of its divisors is an integer number (916241500).

Almost surely, 2^3663520561 is an apocalyptic number.

It is an amenable number.

3663520561 is a deficient number, since it is larger than the sum of its proper divisors (1445439).

3663520561 is a wasteful number, since it uses less digits than its factorization.

3663520561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1445438.

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

The square root of 3663520561 is about 60527.0233945136. The cubic root of 3663520561 is about 1541.5805105174.

The spelling of 3663520561 in words is "three billion, six hundred sixty-three million, five hundred twenty thousand, five hundred sixty-one".