6609855749 has 8 divisors (see below), whose sum is σ = 7563899520. Its totient is φ = 5658256656.

The previous prime is 6609855739. The next prime is 6609855761. The reversal of 6609855749 is 9475589066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6609855749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6609855709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 605369 + ... + 616190.

It is an arithmetic number, because the mean of its divisors is an integer number (945487440).

Almost surely, 2^6609855749 is an apocalyptic number.

It is an amenable number.

6609855749 is a deficient number, since it is larger than the sum of its proper divisors (954043771).

6609855749 is a wasteful number, since it uses less digits than its factorization.

6609855749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222339.

The product of its (nonzero) digits is 16329600, while the sum is 59.

The square root of 6609855749 is about 81301.0193601532. The cubic root of 6609855749 is about 1876.7106875451.

The spelling of 6609855749 in words is "six billion, six hundred nine million, eight hundred fifty-five thousand, seven hundred forty-nine".