65216605664957 has 2 divisors, whose sum is σ = 65216605664958. Its totient is φ = 65216605664956.

The previous prime is 65216605664933. The next prime is 65216605664971. The reversal of 65216605664957 is 75946650661256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53842046745796 + 11374558919161 = 7337714^2 + 3372619^2 .

It is a cyclic number.

It is not a de Polignac number, because 65216605664957 - 2¹⁴ = 65216605648573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65216605664257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32608302832478 + 32608302832479.

It is an arithmetic number, because the mean of its divisors is an integer number (32608302832479).

Almost surely, 2^{65216605664957} is an apocalyptic number.

It is an amenable number.

65216605664957 is a deficient number, since it is larger than the sum of its proper divisors (1).

65216605664957 is an equidigital number, since it uses as much as digits as its factorization.

65216605664957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888000, while the sum is 68.

The spelling of 65216605664957 in words is "sixty-five trillion, two hundred sixteen billion, six hundred five million, six hundred sixty-four thousand, nine hundred fifty-seven".