6565640136 has 64 divisors (see below), whose sum is σ = 18523771200. Its totient is φ = 1920979200.

The previous prime is 6565640131. The next prime is 6565640153. The reversal of 6565640136 is 6310465656.

It is not an unprimeable number, because it can be changed into a prime (6565640131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421135 + ... + 436446.

It is an arithmetic number, because the mean of its divisors is an integer number (289433925).

Almost surely, 2^6565640136 is an apocalyptic number.

6565640136 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

6565640136 is an abundant number, since it is smaller than the sum of its proper divisors (11958131064).

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

6565640136 is a wasteful number, since it uses less digits than its factorization.

6565640136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857630 (or 857626 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 42.

The square root of 6565640136 is about 81028.6377523404. The cubic root of 6565640136 is about 1872.5166660489.

The spelling of 6565640136 in words is "six billion, five hundred sixty-five million, six hundred forty thousand, one hundred thirty-six".