65044032665 has 8 divisors (see below), whose sum is σ = 78054769800. Its totient is φ = 52033939072.

The previous prime is 65044032617. The next prime is 65044032709. The reversal of 65044032665 is 56623044056.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 637714009 + 64406318656 = 25253^2 + 253784^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65044032665 - 2¹⁰ = 65044031641 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99911 + ... + 374259.

It is an arithmetic number, because the mean of its divisors is an integer number (9756846225).

Almost surely, 2^65044032665 is an apocalyptic number.

It is an amenable number.

65044032665 is a deficient number, since it is larger than the sum of its proper divisors (13010737135).

65044032665 is a wasteful number, since it uses less digits than its factorization.

65044032665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321771.

The product of its (nonzero) digits is 518400, while the sum is 41.

The spelling of 65044032665 in words is "sixty-five billion, forty-four million, thirty-two thousand, six hundred sixty-five".