65657470217 has 2 divisors, whose sum is σ = 65657470218. Its totient is φ = 65657470216.

The previous prime is 65657470183. The next prime is 65657470243. The reversal of 65657470217 is 71207475656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44603750416 + 21053719801 = 211196^2 + 145099^2 .

It is a cyclic number.

It is not a de Polignac number, because 65657470217 - 2¹⁰ = 65657469193 is a prime.

It is not a weakly prime, because it can be changed into another prime (65657440217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32828735108 + 32828735109.

It is an arithmetic number, because the mean of its divisors is an integer number (32828735109).

Almost surely, 2^65657470217 is an apocalyptic number.

It is an amenable number.

65657470217 is a deficient number, since it is larger than the sum of its proper divisors (1).

65657470217 is an equidigital number, since it uses as much as digits as its factorization.

65657470217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2469600, while the sum is 50.

The spelling of 65657470217 in words is "sixty-five billion, six hundred fifty-seven million, four hundred seventy thousand, two hundred seventeen".