65655661616039 has 16 divisors (see below), whose sum is σ = 72363340281120. Its totient is φ = 59071156623360.

The previous prime is 65655661615963. The next prime is 65655661616047. The reversal of 65655661616039 is 93061616655656.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 65655661616039 - 2⁴⁰ = 64556149988263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65655661616239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237940757 + ... + 238216529.

It is an arithmetic number, because the mean of its divisors is an integer number (4522708767570).

Almost surely, 2^{65655661616039} is an apocalyptic number.

65655661616039 is a deficient number, since it is larger than the sum of its proper divisors (6707678665081).

65655661616039 is a wasteful number, since it uses less digits than its factorization.

65655661616039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499010.

The product of its (nonzero) digits is 157464000, while the sum is 65.

The spelling of 65655661616039 in words is "sixty-five trillion, six hundred fifty-five billion, six hundred sixty-one million, six hundred sixteen thousand, thirty-nine".