65616205660 has 24 divisors (see below), whose sum is σ = 141154863696. Its totient is φ = 25606323840.

The previous prime is 65616205657. The next prime is 65616205673. The reversal of 65616205660 is 6650261656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40009062 + ... + 40010701.

It is an arithmetic number, because the mean of its divisors is an integer number (5881452654).

Almost surely, 2^65616205660 is an apocalyptic number.

It is an amenable number.

65616205660 is an abundant number, since it is smaller than the sum of its proper divisors (75538658036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65616205660 is a wasteful number, since it uses less digits than its factorization.

65616205660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80019813 (or 80019811 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 65616205660 in words is "sixty-five billion, six hundred sixteen million, two hundred five thousand, six hundred sixty".