65556665660 has 96 divisors (see below), whose sum is σ = 144458500032. Its totient is φ = 24966789120.

The previous prime is 65556665623. The next prime is 65556665677. The reversal of 65556665660 is 6656665556.

It is a junction number, because it is equal to n+sod(n) for n = 65556665596 and 65556665605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7151480 + ... + 7160640.

It is an arithmetic number, because the mean of its divisors is an integer number (1504776042).

Almost surely, 2^65556665660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65556665660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72229250016).

65556665660 is an abundant number, since it is smaller than the sum of its proper divisors (78901834372).

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

65556665660 is a wasteful number, since it uses less digits than its factorization.

65556665660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9423 (or 9421 counting only the distinct ones).

The product of its (nonzero) digits is 29160000, while the sum is 56.

The spelling of 65556665660 in words is "sixty-five billion, five hundred fifty-six million, six hundred sixty-five thousand, six hundred sixty".