65701665217 has 2 divisors, whose sum is σ = 65701665218. Its totient is φ = 65701665216.

The previous prime is 65701665209. The next prime is 65701665241. The reversal of 65701665217 is 71256610756.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34925629456 + 30776035761 = 186884^2 + 175431^2 .

It is a cyclic number.

It is not a de Polignac number, because 65701665217 - 2³ = 65701665209 is a prime.

It is not a weakly prime, because it can be changed into another prime (65701365217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32850832608 + 32850832609.

It is an arithmetic number, because the mean of its divisors is an integer number (32850832609).

Almost surely, 2^65701665217 is an apocalyptic number.

It is an amenable number.

65701665217 is a deficient number, since it is larger than the sum of its proper divisors (1).

65701665217 is an equidigital number, since it uses as much as digits as its factorization.

65701665217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 529200, while the sum is 46.

The spelling of 65701665217 in words is "sixty-five billion, seven hundred one million, six hundred sixty-five thousand, two hundred seventeen".