166603189 has 2 divisors, whose sum is σ = 166603190. Its totient is φ = 166603188.

The previous prime is 166603183. The next prime is 166603211. The reversal of 166603189 is 981306661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165636900 + 966289 = 12870^2 + 983^2 .

It is a cyclic number.

It is not a de Polignac number, because 166603189 - 2³ = 166603181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166603181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83301594 + 83301595.

It is an arithmetic number, because the mean of its divisors is an integer number (83301595).

Almost surely, 2^166603189 is an apocalyptic number.

It is an amenable number.

166603189 is a deficient number, since it is larger than the sum of its proper divisors (1).

166603189 is an equidigital number, since it uses as much as digits as its factorization.

166603189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 166603189 is about 12907.4857737671. The cubic root of 166603189 is about 550.2513330649.

The spelling of 166603189 in words is "one hundred sixty-six million, six hundred three thousand, one hundred eighty-nine".