166870243 has 2 divisors, whose sum is σ = 166870244. Its totient is φ = 166870242.

The previous prime is 166870219. The next prime is 166870261. The reversal of 166870243 is 342078661.

It is a strong prime.

It is an emirp because it is prime and its reverse (342078661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166870243 - 2⁵ = 166870211 is a prime.

It is not a weakly prime, because it can be changed into another prime (166870213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83435121 + 83435122.

It is an arithmetic number, because the mean of its divisors is an integer number (83435122).

Almost surely, 2^166870243 is an apocalyptic number.

166870243 is a deficient number, since it is larger than the sum of its proper divisors (1).

166870243 is an equidigital number, since it uses as much as digits as its factorization.

166870243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 166870243 is about 12917.8265586746. The cubic root of 166870243 is about 550.5451817298.

The spelling of 166870243 in words is "one hundred sixty-six million, eight hundred seventy thousand, two hundred forty-three".