63309664321 has 6 divisors (see below), whose sum is σ = 64268692530. Its totient is φ = 62364739536.

The previous prime is 63309664309. The next prime is 63309664337. The reversal of 63309664321 is 12346690336.

It can be written as a sum of positive squares in only one way, i.e., 61720446096 + 1589218225 = 248436^2 + 39865^2 .

It is not a de Polignac number, because 63309664321 - 2¹⁹ = 63309140033 is a prime.

It is a super-2 number, since 2×63309664321² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63309664361) 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 5 ways as a sum of consecutive naturals, for example, 7047156 + ... + 7056133.

It is an arithmetic number, because the mean of its divisors is an integer number (10711448755).

Almost surely, 2^63309664321 is an apocalyptic number.

It is an amenable number.

63309664321 is a deficient number, since it is larger than the sum of its proper divisors (959028209).

63309664321 is an equidigital number, since it uses as much as digits as its factorization.

63309664321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14103423 (or 14103356 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 43.

The spelling of 63309664321 in words is "sixty-three billion, three hundred nine million, six hundred sixty-four thousand, three hundred twenty-one".