6618645 has 32 divisors (see below), whose sum is σ = 12839040. Its totient is φ = 3208320.

The previous prime is 6618617. The next prime is 6618653. The reversal of 6618645 is 5468166.

6618645 is a `hidden beast` number, since 6 + 6 + 1 + 8 + 645 = 666.

It is not a de Polignac number, because 6618645 - 2⁶ = 6618581 is a prime.

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

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 31 ways as a sum of consecutive naturals, for example, 744 + ... + 3713.

It is an arithmetic number, because the mean of its divisors is an integer number (401220).

Almost surely, 2^6618645 is an apocalyptic number.

It is an amenable number.

6618645 is a deficient number, since it is larger than the sum of its proper divisors (6220395).

6618645 is a wasteful number, since it uses less digits than its factorization.

6618645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4482 (or 4476 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 6618645 is about 2572.6727347255. The cubic root of 6618645 is about 187.7542151757.

The spelling of 6618645 in words is "six million, six hundred eighteen thousand, six hundred forty-five".