6545777688 has 96 divisors (see below), whose sum is σ = 18388890000. Its totient is φ = 2101010688.

The previous prime is 6545777687. The next prime is 6545777701. The reversal of 6545777688 is 8867775456.

6545777688 is a `hidden beast` number, since 6 + 54 + 577 + 7 + 6 + 8 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6545777681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 808203 + ... + 816261.

Almost surely, 2^6545777688 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 6545777688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9194445000).

6545777688 is an abundant number, since it is smaller than the sum of its proper divisors (11843112312).

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

6545777688 is a wasteful number, since it uses less digits than its factorization.

6545777688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8489 (or 8482 counting only the distinct ones).

The product of its digits is 79027200, while the sum is 63.

The square root of 6545777688 is about 80905.9805453219. The cubic root of 6545777688 is about 1870.6265059314.

The spelling of 6545777688 in words is "six billion, five hundred forty-five million, seven hundred seventy-seven thousand, six hundred eighty-eight".