65643108616 has 8 divisors (see below), whose sum is σ = 123080828670. Its totient is φ = 32821554304.

The previous prime is 65643108611. The next prime is 65643108649. The reversal of 65643108616 is 61680134656.

It can be written as a sum of positive squares in only one way, i.e., 55768711716 + 9874396900 = 236154^2 + 99370^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (65643108611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4102694281 + ... + 4102694296.

Almost surely, 2^65643108616 is an apocalyptic number.

It is an amenable number.

65643108616 is a deficient number, since it is larger than the sum of its proper divisors (57437720054).

65643108616 is a wasteful number, since it uses less digits than its factorization.

65643108616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8205388583 (or 8205388579 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 65643108616 in words is "sixty-five billion, six hundred forty-three million, one hundred eight thousand, six hundred sixteen".