65651561010209 has 2 divisors, whose sum is σ = 65651561010210. Its totient is φ = 65651561010208.

The previous prime is 65651561010149. The next prime is 65651561010239. The reversal of 65651561010209 is 90201016515656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65293833811600 + 357727198609 = 8080460^2 + 598103^2 .

It is a cyclic number.

It is not a de Polignac number, because 65651561010209 - 2¹² = 65651561006113 is a prime.

It is not a weakly prime, because it can be changed into another prime (65651561010239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32825780505104 + 32825780505105.

It is an arithmetic number, because the mean of its divisors is an integer number (32825780505105).

Almost surely, 2^{65651561010209} is an apocalyptic number.

It is an amenable number.

65651561010209 is a deficient number, since it is larger than the sum of its proper divisors (1).

65651561010209 is an equidigital number, since it uses as much as digits as its factorization.

65651561010209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486000, while the sum is 47.

The spelling of 65651561010209 in words is "sixty-five trillion, six hundred fifty-one billion, five hundred sixty-one million, ten thousand, two hundred nine".