5666051651561 has 32 divisors (see below), whose sum is σ = 7137976780800. Its totient is φ = 4385298234240.

The previous prime is 5666051651549. The next prime is 5666051651581. The reversal of 5666051651561 is 1651561506665.

It is not a de Polignac number, because 5666051651561 - 2⁶ = 5666051651497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5666051651531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2436251 + ... + 4155408.

It is an arithmetic number, because the mean of its divisors is an integer number (223061774400).

Almost surely, 2^{5666051651561} is an apocalyptic number.

It is an amenable number.

5666051651561 is a deficient number, since it is larger than the sum of its proper divisors (1471925129239).

5666051651561 is a wasteful number, since it uses less digits than its factorization.

5666051651561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6591989.

The product of its (nonzero) digits is 4860000, while the sum is 53.

The spelling of 5666051651561 in words is "five trillion, six hundred sixty-six billion, fifty-one million, six hundred fifty-one thousand, five hundred sixty-one".