64716217 has 2 divisors, whose sum is σ = 64716218. Its totient is φ = 64716216.

The previous prime is 64716209. The next prime is 64716221. The reversal of 64716217 is 71261746.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57214096 + 7502121 = 7564^2 + 2739^2 .

It is a cyclic number.

It is not a de Polignac number, because 64716217 - 2³ = 64716209 is a prime.

It is not a weakly prime, because it can be changed into another prime (64716017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32358108 + 32358109.

It is an arithmetic number, because the mean of its divisors is an integer number (32358109).

Almost surely, 2^64716217 is an apocalyptic number.

It is an amenable number.

64716217 is a deficient number, since it is larger than the sum of its proper divisors (1).

64716217 is an equidigital number, since it uses as much as digits as its factorization.

64716217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 34.

The square root of 64716217 is about 8044.6390223552. The cubic root of 64716217 is about 401.4865870530.

The spelling of 64716217 in words is "sixty-four million, seven hundred sixteen thousand, two hundred seventeen".