166642297 has 2 divisors, whose sum is σ = 166642298. Its totient is φ = 166642296.

The previous prime is 166642261. The next prime is 166642319. The reversal of 166642297 is 792246661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166642281 + 16 = 12909^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 166642297 - 2⁷ = 166642169 is a prime.

It is not a weakly prime, because it can be changed into another prime (166642097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83321148 + 83321149.

It is an arithmetic number, because the mean of its divisors is an integer number (83321149).

Almost surely, 2^166642297 is an apocalyptic number.

It is an amenable number.

166642297 is a deficient number, since it is larger than the sum of its proper divisors (1).

166642297 is an equidigital number, since it uses as much as digits as its factorization.

166642297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 43.

The square root of 166642297 is about 12909.0006197227. Note that the first 3 decimals coincide. The cubic root of 166642297 is about 550.2943845529.

The spelling of 166642297 in words is "one hundred sixty-six million, six hundred forty-two thousand, two hundred ninety-seven".