166211173 has 2 divisors, whose sum is σ = 166211174. Its totient is φ = 166211172.

The previous prime is 166211137. The next prime is 166211191. The reversal of 166211173 is 371112661.

166211173 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (166211137) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146337409 + 19873764 = 12097^2 + 4458^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166211173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166211113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83105586 + 83105587.

It is an arithmetic number, because the mean of its divisors is an integer number (83105587).

Almost surely, 2^166211173 is an apocalyptic number.

It is an amenable number.

166211173 is a deficient number, since it is larger than the sum of its proper divisors (1).

166211173 is an equidigital number, since it uses as much as digits as its factorization.

166211173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 28.

The square root of 166211173 is about 12892.2912238283. The cubic root of 166211173 is about 549.8194150941.

The spelling of 166211173 in words is "one hundred sixty-six million, two hundred eleven thousand, one hundred seventy-three".