6565715561220 has 96 divisors (see below), whose sum is σ = 18554156544000. Its totient is φ = 1734655025664.

The previous prime is 6565715561219. The next prime is 6565715561221. The reversal of 6565715561220 is 221655175656.

It is an interprime number because it is at equal distance from previous prime (6565715561219) and next prime (6565715561221).

It is not an unprimeable number, because it can be changed into a prime (6565715561221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100349757 + ... + 100415163.

It is an arithmetic number, because the mean of its divisors is an integer number (193272464000).

Almost surely, 2^{6565715561220} is an apocalyptic number.

6565715561220 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 6565715561220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9277078272000).

6565715561220 is an abundant number, since it is smaller than the sum of its proper divisors (11988440982780).

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

6565715561220 is a wasteful number, since it uses less digits than its factorization.

6565715561220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80877 (or 80875 counting only the distinct ones).

The product of its (nonzero) digits is 3780000, while the sum is 51.

The spelling of 6565715561220 in words is "six trillion, five hundred sixty-five billion, seven hundred fifteen million, five hundred sixty-one thousand, two hundred twenty".