6663538 has 16 divisors (see below), whose sum is σ = 11689920. Its totient is φ = 2789136.

The previous prime is 6663523. The next prime is 6663539. The reversal of 6663538 is 8353666.

It is a junction number, because it is equal to n+sod(n) for n = 6663497 and 6663506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6663539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4933 + ... + 6136.

It is an arithmetic number, because the mean of its divisors is an integer number (730620).

Almost surely, 2^6663538 is an apocalyptic number.

6663538 is a deficient number, since it is larger than the sum of its proper divisors (5026382).

6663538 is a wasteful number, since it uses less digits than its factorization.

6663538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11121.

The product of its digits is 77760, while the sum is 37.

The square root of 6663538 is about 2581.3829626772. The cubic root of 6663538 is about 188.1777592888.

The spelling of 6663538 in words is "six million, six hundred sixty-three thousand, five hundred thirty-eight".