6561545161 has 8 divisors (see below), whose sum is σ = 6630624000. Its totient is φ = 6492754320.

The previous prime is 6561545153. The next prime is 6561545171. The reversal of 6561545161 is 1615451656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6561545161 - 2³ = 6561545153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6561545171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26041 + ... + 117478.

It is an arithmetic number, because the mean of its divisors is an integer number (828828000).

Almost surely, 2^6561545161 is an apocalyptic number.

It is an amenable number.

6561545161 is a deficient number, since it is larger than the sum of its proper divisors (69078839).

6561545161 is a wasteful number, since it uses less digits than its factorization.

6561545161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143999.

The product of its digits is 108000, while the sum is 40.

The square root of 6561545161 is about 81003.3651214565. The cubic root of 6561545161 is about 1872.1272902744.

The spelling of 6561545161 in words is "six billion, five hundred sixty-one million, five hundred forty-five thousand, one hundred sixty-one".