166656566671 has 16 divisors (see below), whose sum is σ = 192154636800. Its totient is φ = 141585901920.

The previous prime is 166656566653. The next prime is 166656566683. The reversal of 166656566671 is 176665656661.

166656566671 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 166656566671 - 2⁵ = 166656566639 is a prime.

It is a super-2 number, since 2×166656566671² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166656566621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203736 + ... + 612226.

It is an arithmetic number, because the mean of its divisors is an integer number (12009664800).

Almost surely, 2^166656566671 is an apocalyptic number.

166656566671 is a deficient number, since it is larger than the sum of its proper divisors (25498070129).

166656566671 is a wasteful number, since it uses less digits than its factorization.

166656566671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409014.

The product of its digits is 48988800, while the sum is 61.

The spelling of 166656566671 in words is "one hundred sixty-six billion, six hundred fifty-six million, five hundred sixty-six thousand, six hundred seventy-one".