6566138 has 4 divisors (see below), whose sum is σ = 9849210. Its totient is φ = 3283068.

The previous prime is 6566089. The next prime is 6566171. The reversal of 6566138 is 8316656.

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., 6538249 + 27889 = 2557^2 + 167^2 .

It is a super-2 number, since 2×6566138² = 86228336470088, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6566098 and 6566107.

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 as a sum of consecutive naturals, namely, 1641533 + ... + 1641536.

Almost surely, 2^6566138 is an apocalyptic number.

6566138 is a deficient number, since it is larger than the sum of its proper divisors (3283072).

6566138 is a wasteful number, since it uses less digits than its factorization.

6566138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3283071.

The product of its digits is 25920, while the sum is 35.

The square root of 6566138 is about 2562.4476580020. The cubic root of 6566138 is about 187.2563995025.

The spelling of 6566138 in words is "six million, five hundred sixty-six thousand, one hundred thirty-eight".