166656566669 has 16 divisors (see below), whose sum is σ = 176662261440. Its totient is φ = 156937200000.

The previous prime is 166656566653. The next prime is 166656566683. The reversal of 166656566669 is 966665656661.

It is a cyclic number.

It is not a de Polignac number, because 166656566669 - 2⁴ = 166656566653 is a prime.

It is a super-2 number, since 2×166656566669² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 166656566599 and 166656566608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166656566639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4226294 + ... + 4265544.

It is an arithmetic number, because the mean of its divisors is an integer number (11041391340).

Almost surely, 2^166656566669 is an apocalyptic number.

It is an amenable number.

166656566669 is a deficient number, since it is larger than the sum of its proper divisors (10005694771).

166656566669 is a wasteful number, since it uses less digits than its factorization.

166656566669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42892.

The product of its digits is 377913600, while the sum is 68.

The spelling of 166656566669 in words is "one hundred sixty-six billion, six hundred fifty-six million, five hundred sixty-six thousand, six hundred sixty-nine".