6617645 has 4 divisors (see below), whose sum is σ = 7941180. Its totient is φ = 5294112.

The previous prime is 6617627. The next prime is 6617693. The reversal of 6617645 is 5467166.

6617645 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4932841 + 1684804 = 2221^2 + 1298^2 .

It is a cyclic number.

It is not a de Polignac number, because 6617645 - 2⁶ = 6617581 is a prime.

It is a super-3 number, since 3×6617645³ (a number of 21 digits) contains 333 as substring.

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 3 ways as a sum of consecutive naturals, for example, 661760 + ... + 661769.

It is an arithmetic number, because the mean of its divisors is an integer number (1985295).

Almost surely, 2^6617645 is an apocalyptic number.

It is an amenable number.

6617645 is a deficient number, since it is larger than the sum of its proper divisors (1323535).

6617645 is a wasteful number, since it uses less digits than its factorization.

6617645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1323534.

The product of its digits is 30240, while the sum is 35.

The square root of 6617645 is about 2572.4783769742. The cubic root of 6617645 is about 187.7447588760.

The spelling of 6617645 in words is "six million, six hundred seventeen thousand, six hundred forty-five".