166343173 has 2 divisors, whose sum is σ = 166343174. Its totient is φ = 166343172.

The previous prime is 166343171. The next prime is 166343183. The reversal of 166343173 is 371343661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120956004 + 45387169 = 10998^2 + 6737^2 .

It is a cyclic number.

It is not a de Polignac number, because 166343173 - 2¹ = 166343171 is a prime.

Together with 166343171, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166343171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83171586 + 83171587.

It is an arithmetic number, because the mean of its divisors is an integer number (83171587).

Almost surely, 2^166343173 is an apocalyptic number.

It is an amenable number.

166343173 is a deficient number, since it is larger than the sum of its proper divisors (1).

166343173 is an equidigital number, since it uses as much as digits as its factorization.

166343173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 34.

The square root of 166343173 is about 12897.4095461065. The cubic root of 166343173 is about 549.9649266891.

The spelling of 166343173 in words is "one hundred sixty-six million, three hundred forty-three thousand, one hundred seventy-three".