65481287309 has 2 divisors, whose sum is σ = 65481287310. Its totient is φ = 65481287308.

The previous prime is 65481287297. The next prime is 65481287341. The reversal of 65481287309 is 90378218456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60124511209 + 5356776100 = 245203^2 + 73190^2 .

It is a cyclic number.

It is not a de Polignac number, because 65481287309 - 2²⁴ = 65464510093 is a prime.

It is a super-2 number, since 2×65481287309² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is a weakly prime.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32740643654 + 32740643655.

It is an arithmetic number, because the mean of its divisors is an integer number (32740643655).

It is a 2-persistent number, because it is pandigital, and so is 2⋅65481287309 = 130962574618, but 3⋅65481287309 = 196443861927 is not.

Almost surely, 2^65481287309 is an apocalyptic number.

It is an amenable number.

65481287309 is a deficient number, since it is larger than the sum of its proper divisors (1).

65481287309 is an equidigital number, since it uses as much as digits as its factorization.

65481287309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 65481287309 in words is "sixty-five billion, four hundred eighty-one million, two hundred eighty-seven thousand, three hundred nine".