65668717 has 2 divisors, whose sum is σ = 65668718. Its totient is φ = 65668716.

The previous prime is 65668661. The next prime is 65668721. The reversal of 65668717 is 71786656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34821801 + 30846916 = 5901^2 + 5554^2 .

It is a cyclic number.

It is not a de Polignac number, because 65668717 - 2¹⁵ = 65635949 is a prime.

It is a super-3 number, since 3×65668717³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65668787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32834358 + 32834359.

It is an arithmetic number, because the mean of its divisors is an integer number (32834359).

Almost surely, 2^65668717 is an apocalyptic number.

It is an amenable number.

65668717 is a deficient number, since it is larger than the sum of its proper divisors (1).

65668717 is an equidigital number, since it uses as much as digits as its factorization.

65668717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 46.

The square root of 65668717 is about 8103.6236956068. The cubic root of 65668717 is about 403.4467089391.

The spelling of 65668717 in words is "sixty-five million, six hundred sixty-eight thousand, seven hundred seventeen".