6561612 has 72 divisors (see below), whose sum is σ = 17886960. Its totient is φ = 2021760.

The previous prime is 6561589. The next prime is 6561613. The reversal of 6561612 is 2161656.

It is a happy number.

6561612 is a `hidden beast` number, since 656 + 1 + 6 + 1 + 2 = 666.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (6561613) 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, 36162 + ... + 36342.

It is an arithmetic number, because the mean of its divisors is an integer number (248430).

Almost surely, 2^6561612 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 6561612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8943480).

6561612 is an abundant number, since it is smaller than the sum of its proper divisors (11325348).

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

6561612 is a wasteful number, since it uses less digits than its factorization.

6561612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 258 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 6561612 is about 2561.5643657734. The cubic root of 6561612 is about 187.2133647044.

The spelling of 6561612 in words is "six million, five hundred sixty-one thousand, six hundred twelve".