65256533565217 has 2 divisors, whose sum is σ = 65256533565218. Its totient is φ = 65256533565216.

The previous prime is 65256533565107. The next prime is 65256533565323. The reversal of 65256533565217 is 71256533565256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55440994948641 + 9815538616576 = 7445871^2 + 3132976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65256533565217 is a prime.

It is not a weakly prime, because it can be changed into another prime (65256533560217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32628266782608 + 32628266782609.

It is an arithmetic number, because the mean of its divisors is an integer number (32628266782609).

Almost surely, 2^{65256533565217} is an apocalyptic number.

It is an amenable number.

65256533565217 is a deficient number, since it is larger than the sum of its proper divisors (1).

65256533565217 is an equidigital number, since it uses as much as digits as its factorization.

65256533565217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 170100000, while the sum is 61.

The spelling of 65256533565217 in words is "sixty-five trillion, two hundred fifty-six billion, five hundred thirty-three million, five hundred sixty-five thousand, two hundred seventeen".