63645114240221 has 4 divisors (see below), whose sum is σ = 63654952724700. Its totient is φ = 63635275755744.

The previous prime is 63645114240163. The next prime is 63645114240317. The reversal of 63645114240221 is 12204241154636.

63645114240221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 34020225974596 + 29624888265625 = 5832686^2 + 5442875^2 .

It is a cyclic number.

It is not a de Polignac number, because 63645114240221 - 2⁴² = 59247067729117 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 (63645114290221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4919232536 + ... + 4919245473.

It is an arithmetic number, because the mean of its divisors is an integer number (15913738181175).

Almost surely, 2^{63645114240221} is an apocalyptic number.

It is an amenable number.

63645114240221 is a deficient number, since it is larger than the sum of its proper divisors (9838484479).

63645114240221 is an equidigital number, since it uses as much as digits as its factorization.

63645114240221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9838484478.

The product of its (nonzero) digits is 276480, while the sum is 41.

Adding to 63645114240221 its reverse (12204241154636), we get a palindrome (75849355394857).

The spelling of 63645114240221 in words is "sixty-three trillion, six hundred forty-five billion, one hundred fourteen million, two hundred forty thousand, two hundred twenty-one".