6565489280 has 128 divisors (see below), whose sum is σ = 18191381760. Its totient is φ = 2219212800.

The previous prime is 6565489279. The next prime is 6565489283. The reversal of 6565489280 is 829845656.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (6565489283) 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, 307760 + ... + 328400.

It is an arithmetic number, because the mean of its divisors is an integer number (142120170).

Almost surely, 2^6565489280 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 6565489280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9095690880).

6565489280 is an abundant number, since it is smaller than the sum of its proper divisors (11625892480).

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

6565489280 is a wasteful number, since it uses less digits than its factorization.

6565489280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20738 (or 20726 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 53.

The square root of 6565489280 is about 81027.7068662319. The cubic root of 6565489280 is about 1872.5023245919.

The spelling of 6565489280 in words is "six billion, five hundred sixty-five million, four hundred eighty-nine thousand, two hundred eighty".