63664165321 has 2 divisors, whose sum is σ = 63664165322. Its totient is φ = 63664165320.

The previous prime is 63664165307. The next prime is 63664165337. The reversal of 63664165321 is 12356146636.

63664165321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63433459600 + 230705721 = 251860^2 + 15189^2 .

It is a cyclic number.

It is not a de Polignac number, because 63664165321 - 2¹¹ = 63664163273 is a prime.

It is not a weakly prime, because it can be changed into another prime (63664165391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31832082660 + 31832082661.

It is an arithmetic number, because the mean of its divisors is an integer number (31832082661).

Almost surely, 2^63664165321 is an apocalyptic number.

It is an amenable number.

63664165321 is a deficient number, since it is larger than the sum of its proper divisors (1).

63664165321 is an equidigital number, since it uses as much as digits as its factorization.

63664165321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 43.

The spelling of 63664165321 in words is "sixty-three billion, six hundred sixty-four million, one hundred sixty-five thousand, three hundred twenty-one".