65564580817 has 2 divisors, whose sum is σ = 65564580818. Its totient is φ = 65564580816.

The previous prime is 65564580803. The next prime is 65564580841. The reversal of 65564580817 is 71808546556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65538048016 + 26532801 = 256004^2 + 5151^2 .

It is a cyclic number.

It is not a de Polignac number, because 65564580817 - 2¹¹ = 65564578769 is a prime.

It is not a weakly prime, because it can be changed into another prime (65564580317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32782290408 + 32782290409.

It is an arithmetic number, because the mean of its divisors is an integer number (32782290409).

Almost surely, 2^65564580817 is an apocalyptic number.

It is an amenable number.

65564580817 is a deficient number, since it is larger than the sum of its proper divisors (1).

65564580817 is an equidigital number, since it uses as much as digits as its factorization.

65564580817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064000, while the sum is 55.

The spelling of 65564580817 in words is "sixty-five billion, five hundred sixty-four million, five hundred eighty thousand, eight hundred seventeen".