6566642 has 16 divisors (see below), whose sum is σ = 10237752. Its totient is φ = 3156480.

The previous prime is 6566629. The next prime is 6566657. The reversal of 6566642 is 2466656.

It can be written as a sum of positive squares in 4 ways, for example, as 3500641 + 3066001 = 1871^2 + 1751^2 .

It is an Ulam 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 7 ways as a sum of consecutive naturals, for example, 5438 + ... + 6534.

Almost surely, 2^6566642 is an apocalyptic number.

6566642 is a deficient number, since it is larger than the sum of its proper divisors (3671110).

6566642 is a wasteful number, since it uses less digits than its factorization.

6566642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213.

The product of its digits is 51840, while the sum is 35.

The square root of 6566642 is about 2562.5459995871. The cubic root of 6566642 is about 187.2611904877.

The spelling of 6566642 in words is "six million, five hundred sixty-six thousand, six hundred forty-two".