63664321 has 4 divisors (see below), whose sum is σ = 72759232. Its totient is φ = 54569412.

The previous prime is 63664319. The next prime is 63664327. The reversal of 63664321 is 12346636.

63664321 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63664321 - 2¹ = 63664319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63664327) 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 3 ways as a sum of consecutive naturals, for example, 4547445 + ... + 4547458.

It is an arithmetic number, because the mean of its divisors is an integer number (18189808).

Almost surely, 2^63664321 is an apocalyptic number.

It is an amenable number.

63664321 is a deficient number, since it is larger than the sum of its proper divisors (9094911).

63664321 is an equidigital number, since it uses as much as digits as its factorization.

63664321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9094910.

The product of its digits is 15552, while the sum is 31.

The square root of 63664321 is about 7978.9924802571. The cubic root of 63664321 is about 399.2994425143.

The spelling of 63664321 in words is "sixty-three million, six hundred sixty-four thousand, three hundred twenty-one".