5666166650601 has 12 divisors (see below), whose sum is σ = 8184491410420. Its totient is φ = 3777431293440.

The previous prime is 5666166650533. The next prime is 5666166650611. The reversal of 5666166650601 is 1060566616665.

It can be written as a sum of positive squares in 2 ways, for example, as 5591801360601 + 74365290000 = 2364699^2 + 272700^2 .

It is a de Polignac number, because none of the positive numbers 2^k-5666166650601 is a prime.

It is a super-2 number, since 2×5666166650601² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5666166650611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2138481 + ... + 3988161.

Almost surely, 2^{5666166650601} is an apocalyptic number.

It is an amenable number.

5666166650601 is a deficient number, since it is larger than the sum of its proper divisors (2518324759819).

5666166650601 is a wasteful number, since it uses less digits than its factorization.

5666166650601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190056 (or 2190053 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 54.

The spelling of 5666166650601 in words is "five trillion, six hundred sixty-six billion, one hundred sixty-six million, six hundred fifty thousand, six hundred one".