63646221 has 16 divisors (see below), whose sum is σ = 88744320. Its totient is φ = 40497600.

The previous prime is 63646217. The next prime is 63646243. The reversal of 63646221 is 12264636.

63646221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 63646221 - 2² = 63646217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63646211) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 48271 + ... + 49571.

It is an arithmetic number, because the mean of its divisors is an integer number (5546520).

Almost surely, 2^63646221 is an apocalyptic number.

It is an amenable number.

63646221 is a deficient number, since it is larger than the sum of its proper divisors (25098099).

63646221 is a wasteful number, since it uses less digits than its factorization.

63646221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2036.

The product of its digits is 10368, while the sum is 30.

The square root of 63646221 is about 7977.8581712136. The cubic root of 63646221 is about 399.2615981622.

The spelling of 63646221 in words is "sixty-three million, six hundred forty-six thousand, two hundred twenty-one".