166051243 has 2 divisors, whose sum is σ = 166051244. Its totient is φ = 166051242.

The previous prime is 166051231. The next prime is 166051247. The reversal of 166051243 is 342150661.

It is a strong prime.

It is an emirp because it is prime and its reverse (342150661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166051243 - 2¹⁷ = 165920171 is a prime.

It is not a weakly prime, because it can be changed into another prime (166051247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83025621 + 83025622.

It is an arithmetic number, because the mean of its divisors is an integer number (83025622).

Almost surely, 2^166051243 is an apocalyptic number.

166051243 is a deficient number, since it is larger than the sum of its proper divisors (1).

166051243 is an equidigital number, since it uses as much as digits as its factorization.

166051243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 166051243 is about 12886.0871873505. The cubic root of 166051243 is about 549.6430113146.

The spelling of 166051243 in words is "one hundred sixty-six million, fifty-one thousand, two hundred forty-three".