6659690 has 16 divisors (see below), whose sum is σ = 12618720. Its totient is φ = 2523600.

The previous prime is 6659689. The next prime is 6659693. The reversal of 6659690 is 969566.

It is a super-2 number, since 2×6659690² = 88702941792200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6659693) 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, 17336 + ... + 17715.

It is an arithmetic number, because the mean of its divisors is an integer number (788670).

Almost surely, 2^6659690 is an apocalyptic number.

6659690 is a deficient number, since it is larger than the sum of its proper divisors (5959030).

6659690 is a wasteful number, since it uses less digits than its factorization.

6659690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35077.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 6659690 is about 2580.6375181338. The cubic root of 6659690 is about 188.1415299140.

The spelling of 6659690 in words is "six million, six hundred fifty-nine thousand, six hundred ninety".