6561165 has 16 divisors (see below), whose sum is σ = 11305728. Its totient is φ = 3230016.

The previous prime is 6561161. The next prime is 6561193. The reversal of 6561165 is 5611656.

6561165 = 157² + 158² + ... + 286².

It is not a de Polignac number, because 6561165 - 2² = 6561161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561161) 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 15 ways as a sum of consecutive naturals, for example, 16629 + ... + 17018.

It is an arithmetic number, because the mean of its divisors is an integer number (706608).

Almost surely, 2^6561165 is an apocalyptic number.

6561165 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6561165 is a deficient number, since it is larger than the sum of its proper divisors (4744563).

6561165 is a wasteful number, since it uses less digits than its factorization.

6561165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33668.

The product of its digits is 5400, while the sum is 30.

The square root of 6561165 is about 2561.4771129175. The cubic root of 6561165 is about 187.2091133977.

The spelling of 6561165 in words is "six million, five hundred sixty-one thousand, one hundred sixty-five".