65309686544 has 20 divisors (see below), whose sum is σ = 129623799900. Its totient is φ = 31858383360.

The previous prime is 65309686529. The next prime is 65309686571. The reversal of 65309686544 is 44568690356.

It can be written as a sum of positive squares in 2 ways, for example, as 25213628944 + 40096057600 = 158788^2 + 200240^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 65309686544.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 49778069 + ... + 49779380.

It is an arithmetic number, because the mean of its divisors is an integer number (6481189995).

Almost surely, 2^65309686544 is an apocalyptic number.

It is an amenable number.

65309686544 is a deficient number, since it is larger than the sum of its proper divisors (64314113356).

65309686544 is a wasteful number, since it uses less digits than its factorization.

65309686544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99557498 (or 99557492 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 56.

The spelling of 65309686544 in words is "sixty-five billion, three hundred nine million, six hundred eighty-six thousand, five hundred forty-four".