6609115561 has 8 divisors (see below), whose sum is σ = 6622616000. Its totient is φ = 6595628688.

The previous prime is 6609115559. The next prime is 6609115567. The reversal of 6609115561 is 1655119066.

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 6609115561 - 2¹ = 6609115559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6609115567) 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, 1996870 + ... + 2000176.

It is an arithmetic number, because the mean of its divisors is an integer number (827827000).

Almost surely, 2^6609115561 is an apocalyptic number.

It is an amenable number.

6609115561 is a deficient number, since it is larger than the sum of its proper divisors (13500439).

6609115561 is a wasteful number, since it uses less digits than its factorization.

6609115561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6783.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 6609115561 is about 81296.4670880599. The cubic root of 6609115561 is about 1876.6406320280.

The spelling of 6609115561 in words is "six billion, six hundred nine million, one hundred fifteen thousand, five hundred sixty-one".