5665561049966 has 16 divisors (see below), whose sum is σ = 8760770060400. Its totient is φ = 2746619794368.

The previous prime is 5665561049921. The next prime is 5665561049989. The reversal of 5665561049966 is 6699401655665.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 5665561049896 and 5665561049905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328849121 + ... + 328866348.

It is an arithmetic number, because the mean of its divisors is an integer number (547548128775).

Almost surely, 2^{5665561049966} is an apocalyptic number.

5665561049966 is a deficient number, since it is larger than the sum of its proper divisors (3095209010434).

5665561049966 is a wasteful number, since it uses less digits than its factorization.

5665561049966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657715603.

The product of its (nonzero) digits is 314928000, while the sum is 68.

The spelling of 5665561049966 in words is "five trillion, six hundred sixty-five billion, five hundred sixty-one million, forty-nine thousand, nine hundred sixty-six".