6559906 has 4 divisors (see below), whose sum is σ = 9839862. Its totient is φ = 3279952.

The previous prime is 6559901. The next prime is 6559907. The reversal of 6559906 is 6099556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6125625 + 434281 = 2475^2 + 659^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6559901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1639975 + ... + 1639978.

Almost surely, 2^6559906 is an apocalyptic number.

6559906 is a deficient number, since it is larger than the sum of its proper divisors (3279956).

6559906 is a wasteful number, since it uses less digits than its factorization.

6559906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3279955.

The product of its (nonzero) digits is 72900, while the sum is 40.

The square root of 6559906 is about 2561.2313444904. The cubic root of 6559906 is about 187.1971383216.

The spelling of 6559906 in words is "six million, five hundred fifty-nine thousand, nine hundred six".