65908398817 has 2 divisors, whose sum is σ = 65908398818. Its totient is φ = 65908398816.

The previous prime is 65908398793. The next prime is 65908398839. The reversal of 65908398817 is 71889380956.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56677801041 + 9230597776 = 238071^2 + 96076^2 .

It is a cyclic number.

It is not a de Polignac number, because 65908398817 - 2²⁷ = 65774181089 is a prime.

It is not a weakly prime, because it can be changed into another prime (65908398847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32954199408 + 32954199409.

It is an arithmetic number, because the mean of its divisors is an integer number (32954199409).

Almost surely, 2^65908398817 is an apocalyptic number.

It is an amenable number.

65908398817 is a deficient number, since it is larger than the sum of its proper divisors (1).

65908398817 is an equidigital number, since it uses as much as digits as its factorization.

65908398817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26127360, while the sum is 64.

The spelling of 65908398817 in words is "sixty-five billion, nine hundred eight million, three hundred ninety-eight thousand, eight hundred seventeen".