64563517 has 2 divisors, whose sum is σ = 64563518. Its totient is φ = 64563516.

The previous prime is 64563509. The next prime is 64563529. The reversal of 64563517 is 71536546.

64563517 is nontrivially palindromic in base 9.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36832761 + 27730756 = 6069^2 + 5266^2 .

It is a cyclic number.

It is not a de Polignac number, because 64563517 - 2³ = 64563509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64563547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32281758 + 32281759.

It is an arithmetic number, because the mean of its divisors is an integer number (32281759).

Almost surely, 2^64563517 is an apocalyptic number.

It is an amenable number.

64563517 is a deficient number, since it is larger than the sum of its proper divisors (1).

64563517 is an equidigital number, since it uses as much as digits as its factorization.

64563517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 37.

The square root of 64563517 is about 8035.1426247454. The cubic root of 64563517 is about 401.1705648533.

The spelling of 64563517 in words is "sixty-four million, five hundred sixty-three thousand, five hundred seventeen".