6618609 has 12 divisors (see below), whose sum is σ = 9611316. Its totient is φ = 4388832.

The previous prime is 6618581. The next prime is 6618617. The reversal of 6618609 is 9068166.

It can be written as a sum of positive squares in 2 ways, for example, as 5419584 + 1199025 = 2328^2 + 1095^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6618609 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6618659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94 + ... + 3639.

It is an arithmetic number, because the mean of its divisors is an integer number (800943).

Almost surely, 2^6618609 is an apocalyptic number.

It is an amenable number.

6618609 is a deficient number, since it is larger than the sum of its proper divisors (2992707).

6618609 is a wasteful number, since it uses less digits than its factorization.

6618609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3936 (or 3933 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 6618609 is about 2572.6657381012. The cubic root of 6618609 is about 187.7538747654.

It can be divided in two parts, 6618 and 609, that added together give a palindrome (7227).

The spelling of 6618609 in words is "six million, six hundred eighteen thousand, six hundred nine".