6604405561 has 8 divisors (see below), whose sum is σ = 7277842880. Its totient is φ = 5954597712.

The previous prime is 6604405559. The next prime is 6604405601. The reversal of 6604405561 is 1655044066.

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

It is a cyclic number.

It is not a de Polignac number, because 6604405561 - 2¹ = 6604405559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6604405561.

It is not an unprimeable number, because it can be changed into a prime (6604402561) 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, 5906781 + ... + 5907898.

It is an arithmetic number, because the mean of its divisors is an integer number (909730360).

Almost surely, 2^6604405561 is an apocalyptic number.

It is an amenable number.

6604405561 is a deficient number, since it is larger than the sum of its proper divisors (673437319).

6604405561 is a wasteful number, since it uses less digits than its factorization.

6604405561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11814735.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 6604405561 is about 81267.4938767032. The cubic root of 6604405561 is about 1876.1947287988.

The spelling of 6604405561 in words is "six billion, six hundred four million, four hundred five thousand, five hundred sixty-one".