65678246903809 has 4 divisors (see below), whose sum is σ = 67453334658004. Its totient is φ = 63903159149616.

The previous prime is 65678246903807. The next prime is 65678246903821. The reversal of 65678246903809 is 90830964287656.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62140191239025 + 3538055664784 = 7882905^2 + 1880972^2 .

It is a cyclic number.

It is not a de Polignac number, because 65678246903809 - 2¹ = 65678246903807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65678246903807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 887543877042 + ... + 887543877115.

It is an arithmetic number, because the mean of its divisors is an integer number (16863333664501).

Almost surely, 2^{65678246903809} is an apocalyptic number.

It is an amenable number.

65678246903809 is a deficient number, since it is larger than the sum of its proper divisors (1775087754195).

65678246903809 is a wasteful number, since it uses less digits than its factorization.

65678246903809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775087754194.

The product of its (nonzero) digits is 940584960, while the sum is 73.

The spelling of 65678246903809 in words is "sixty-five trillion, six hundred seventy-eight billion, two hundred forty-six million, nine hundred three thousand, eight hundred nine".