65560811220 has 144 divisors (see below), whose sum is σ = 200673607680. Its totient is φ = 17324471808.

The previous prime is 65560811149. The next prime is 65560811227. The reversal of 65560811220 is 2211806556.

65560811220 is a `hidden beast` number, since 6 + 5 + 560 + 81 + 12 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65560811227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32894544 + ... + 32896536.

It is an arithmetic number, because the mean of its divisors is an integer number (1393566720).

Almost surely, 2^65560811220 is an apocalyptic number.

65560811220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65560811220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100336803840).

65560811220 is an abundant number, since it is smaller than the sum of its proper divisors (135112796460).

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

65560811220 is a wasteful number, since it uses less digits than its factorization.

65560811220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3574 (or 3569 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The spelling of 65560811220 in words is "sixty-five billion, five hundred sixty million, eight hundred eleven thousand, two hundred twenty".