6659540 has 24 divisors (see below), whose sum is σ = 14035560. Its totient is φ = 2654208.

The previous prime is 6659501. The next prime is 6659561. The reversal of 6659540 is 459566.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13456 + 6646084 = 116^2 + 2578^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6659540.

It is a congruent number.

It is an unprimeable number.

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, 8276 + ... + 9044.

It is an arithmetic number, because the mean of its divisors is an integer number (584815).

Almost surely, 2^6659540 is an apocalyptic number.

It is an amenable number.

6659540 is an abundant number, since it is smaller than the sum of its proper divisors (7376020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6659540 is a wasteful number, since it uses less digits than its factorization.

6659540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211 (or 1209 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 6659540 is about 2580.6084553841. The cubic root of 6659540 is about 188.1401173637.

The spelling of 6659540 in words is "six million, six hundred fifty-nine thousand, five hundred forty".