6561366 has 32 divisors (see below), whose sum is σ = 15517440. Its totient is φ = 1809696.

The previous prime is 6561319. The next prime is 6561383. The reversal of 6561366 is 6631656.

It is a congruent number.

It is an unprimeable number.

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, 1476 + ... + 3911.

It is an arithmetic number, because the mean of its divisors is an integer number (484920).

Almost surely, 2^6561366 is an apocalyptic number.

6561366 is an abundant number, since it is smaller than the sum of its proper divisors (8956074).

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

6561366 is a wasteful number, since it uses less digits than its factorization.

6561366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5428.

The product of its digits is 19440, while the sum is 33.

The square root of 6561366 is about 2561.5163477909. The cubic root of 6561366 is about 187.2110250830.

The spelling of 6561366 in words is "six million, five hundred sixty-one thousand, three hundred sixty-six".