6566055661 has 8 divisors (see below), whose sum is σ = 7284376800. Its totient is φ = 5867969040.

The previous prime is 6566055653. The next prime is 6566055689. The reversal of 6566055661 is 1665506656.

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 6566055661 - 2³ = 6566055653 is a prime.

It is a super-2 number, since 2×6566055661² = 86226173886700293842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6566055611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5057946 + ... + 5059243.

It is an arithmetic number, because the mean of its divisors is an integer number (910547100).

Almost surely, 2^6566055661 is an apocalyptic number.

It is an amenable number.

6566055661 is a deficient number, since it is larger than the sum of its proper divisors (718321139).

6566055661 is a wasteful number, since it uses less digits than its factorization.

6566055661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10117259.

The product of its (nonzero) digits is 972000, while the sum is 46.

The square root of 6566055661 is about 81031.2017743782. The cubic root of 6566055661 is about 1872.5561677100.

It can be divided in two parts, 656605 and 5661, that added together give a palindrome (662266).

The spelling of 6566055661 in words is "six billion, five hundred sixty-six million, fifty-five thousand, six hundred sixty-one".