6569449656 has 256 divisors, whose sum is σ = 21054366720. Its totient is φ = 1658880000.

The previous prime is 6569449609. The next prime is 6569449673.

6569449656 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 6569449656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11385240 + ... + 11385816.

It is an arithmetic number, because the mean of its divisors is an integer number (82243620).

Almost surely, 2^6569449656 is an apocalyptic number.

6569449656 is a gapful number since it is divisible by the number (66) 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 6569449656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10527183360).

6569449656 is an abundant number, since it is smaller than the sum of its proper divisors (14484917064).

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

6569449656 is a wasteful number, since it uses less digits than its factorization.

6569449656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766 (or 762 counting only the distinct ones).

The product of its digits is 41990400, while the sum is 60.

The square root of 6569449656 is about 81052.1415879926. The cubic root of 6569449656 is about 1872.8787536413.

The spelling of 6569449656 in words is "six billion, five hundred sixty-nine million, four hundred forty-nine thousand, six hundred fifty-six".