166203197 has 2 divisors, whose sum is σ = 166203198. Its totient is φ = 166203196.

The previous prime is 166203173. The next prime is 166203199. The reversal of 166203197 is 791302661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156400036 + 9803161 = 12506^2 + 3131^2 .

It is a cyclic number.

It is not a de Polignac number, because 166203197 - 2¹⁰ = 166202173 is a prime.

Together with 166203199, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166203199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83101598 + 83101599.

It is an arithmetic number, because the mean of its divisors is an integer number (83101599).

Almost surely, 2^166203197 is an apocalyptic number.

It is an amenable number.

166203197 is a deficient number, since it is larger than the sum of its proper divisors (1).

166203197 is an equidigital number, since it uses as much as digits as its factorization.

166203197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 166203197 is about 12891.9818879798. The cubic root of 166203197 is about 549.8106201984.

The spelling of 166203197 in words is "one hundred sixty-six million, two hundred three thousand, one hundred ninety-seven".