65387667809 has 2 divisors, whose sum is σ = 65387667810. Its totient is φ = 65387667808.

The previous prime is 65387667803. The next prime is 65387667823. The reversal of 65387667809 is 90876678356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45070016209 + 20317651600 = 212297^2 + 142540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65387667809 is a prime.

It is not a weakly prime, because it can be changed into another prime (65387667803) 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, 32693833904 + 32693833905.

It is an arithmetic number, because the mean of its divisors is an integer number (32693833905).

Almost surely, 2^65387667809 is an apocalyptic number.

It is an amenable number.

65387667809 is a deficient number, since it is larger than the sum of its proper divisors (1).

65387667809 is an equidigital number, since it uses as much as digits as its factorization.

65387667809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91445760, while the sum is 65.

The spelling of 65387667809 in words is "sixty-five billion, three hundred eighty-seven million, six hundred sixty-seven thousand, eight hundred nine".