6565717680 has 40 divisors (see below), whose sum is σ = 20353725552. Its totient is φ = 1750857984.

The previous prime is 6565717657. The next prime is 6565717693. The reversal of 6565717680 is 867175656.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13678339 + ... + 13678818.

Almost surely, 2^6565717680 is an apocalyptic number.

6565717680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6565717680 is an abundant number, since it is smaller than the sum of its proper divisors (13788007872).

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

6565717680 is a wasteful number, since it uses less digits than its factorization.

6565717680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27357173 (or 27357167 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 51.

The square root of 6565717680 is about 81029.1162484202. The cubic root of 6565717680 is about 1872.5240378542.

The spelling of 6565717680 in words is "six billion, five hundred sixty-five million, seven hundred seventeen thousand, six hundred eighty".