5556666561 has 8 divisors (see below), whose sum is σ = 7413065184. Its totient is φ = 3702356160.

The previous prime is 5556666523. The next prime is 5556666607. The reversal of 5556666561 is 1656666555.

5556666561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 5556666561 - 2⁶ = 5556666497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5556616561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 515835 + ... + 526496.

It is an arithmetic number, because the mean of its divisors is an integer number (926633148).

Almost surely, 2^5556666561 is an apocalyptic number.

It is an amenable number.

5556666561 is a deficient number, since it is larger than the sum of its proper divisors (1856398623).

5556666561 is a wasteful number, since it uses less digits than its factorization.

5556666561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044111.

The product of its digits is 4860000, while the sum is 51.

The square root of 5556666561 is about 74543.0517285146. The cubic root of 5556666561 is about 1771.2156693808.

The spelling of 5556666561 in words is "five billion, five hundred fifty-six million, six hundred sixty-six thousand, five hundred sixty-one".