64663221 has 16 divisors (see below), whose sum is σ = 98676864. Its totient is φ = 36897024.

The previous prime is 64663219. The next prime is 64663229. The reversal of 64663221 is 12236646.

It is not a de Polignac number, because 64663221 - 2¹ = 64663219 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64663229) 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 15 ways as a sum of consecutive naturals, for example, 16201 + ... + 19793.

It is an arithmetic number, because the mean of its divisors is an integer number (6167304).

Almost surely, 2^64663221 is an apocalyptic number.

It is an amenable number.

64663221 is a deficient number, since it is larger than the sum of its proper divisors (34013643).

64663221 is a wasteful number, since it uses less digits than its factorization.

64663221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4460.

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

The square root of 64663221 is about 8041.3444771381. The cubic root of 64663221 is about 401.3769648967.

Adding to 64663221 its reverse (12236646), we get a palindrome (76899867).

The spelling of 64663221 in words is "sixty-four million, six hundred sixty-three thousand, two hundred twenty-one".