5666858586665 has 16 divisors (see below), whose sum is σ = 7200350953488. Its totient is φ = 4266747703296.

The previous prime is 5666858586607. The next prime is 5666858586679.

5666858586665 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 8 ways, for example, as 1280636249104 + 4386222337561 = 1131652^2 + 2094331^2 .

It is a cyclic number.

It is not a de Polignac number, because 5666858586665 - 2⁶ = 5666858586601 is a prime.

It is a super-2 number, since 2×5666858586665² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5666858586665.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5705729 + ... + 6624881.

It is an arithmetic number, because the mean of its divisors is an integer number (450021934593).

Almost surely, 2^{5666858586665} is an apocalyptic number.

It is an amenable number.

5666858586665 is a deficient number, since it is larger than the sum of its proper divisors (1533492366823).

5666858586665 is a wasteful number, since it uses less digits than its factorization.

5666858586665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991708.

The product of its digits is 14929920000, while the sum is 80.

The spelling of 5666858586665 in words is "five trillion, six hundred sixty-six billion, eight hundred fifty-eight million, five hundred eighty-six thousand, six hundred sixty-five".