65512571609 has 2 divisors, whose sum is σ = 65512571610. Its totient is φ = 65512571608.

The previous prime is 65512571567. The next prime is 65512571647. The reversal of 65512571609 is 90617521556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64310424025 + 1202147584 = 253595^2 + 34672^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65512571609 is a prime.

It is not a weakly prime, because it can be changed into another prime (65512571669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32756285804 + 32756285805.

It is an arithmetic number, because the mean of its divisors is an integer number (32756285805).

Almost surely, 2^65512571609 is an apocalyptic number.

It is an amenable number.

65512571609 is a deficient number, since it is larger than the sum of its proper divisors (1).

65512571609 is an equidigital number, since it uses as much as digits as its factorization.

65512571609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 567000, while the sum is 47.

The spelling of 65512571609 in words is "sixty-five billion, five hundred twelve million, five hundred seventy-one thousand, six hundred nine".