6610645 has 4 divisors (see below), whose sum is σ = 7932780. Its totient is φ = 5288512.

The previous prime is 6610621. The next prime is 6610673. The reversal of 6610645 is 5460166.

6610645 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 4977361 + 1633284 = 2231^2 + 1278^2 .

It is a cyclic number.

It is not a de Polignac number, because 6610645 - 2⁷ = 6610517 is a prime.

6610645 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661060 + ... + 661069.

It is an arithmetic number, because the mean of its divisors is an integer number (1983195).

Almost surely, 2^6610645 is an apocalyptic number.

It is an amenable number.

6610645 is a deficient number, since it is larger than the sum of its proper divisors (1322135).

6610645 is a wasteful number, since it uses less digits than its factorization.

6610645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322134.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 6610645 is about 2571.1174613386. The cubic root of 6610645 is about 187.6785380897.

The spelling of 6610645 in words is "six million, six hundred ten thousand, six hundred forty-five".