64563027521 has 2 divisors, whose sum is σ = 64563027522. Its totient is φ = 64563027520.

The previous prime is 64563027469. The next prime is 64563027647. The reversal of 64563027521 is 12572036546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61789530625 + 2773496896 = 248575^2 + 52664^2 .

It is a cyclic number.

It is not a de Polignac number, because 64563027521 - 2⁶ = 64563027457 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (64563020521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32281513760 + 32281513761.

It is an arithmetic number, because the mean of its divisors is an integer number (32281513761).

Almost surely, 2^64563027521 is an apocalyptic number.

It is an amenable number.

64563027521 is a deficient number, since it is larger than the sum of its proper divisors (1).

64563027521 is an equidigital number, since it uses as much as digits as its factorization.

64563027521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 41.

The spelling of 64563027521 in words is "sixty-four billion, five hundred sixty-three million, twenty-seven thousand, five hundred twenty-one".