166015243 has 2 divisors, whose sum is σ = 166015244. Its totient is φ = 166015242.

The previous prime is 166015237. The next prime is 166015259. The reversal of 166015243 is 342510661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166015243 - 2⁵ = 166015211 is a prime.

It is a super-2 number, since 2×166015243² = 55122121816698098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166015043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83007621 + 83007622.

It is an arithmetic number, because the mean of its divisors is an integer number (83007622).

Almost surely, 2^166015243 is an apocalyptic number.

166015243 is a deficient number, since it is larger than the sum of its proper divisors (1).

166015243 is an equidigital number, since it uses as much as digits as its factorization.

166015243 is an odious number, because the sum of its binary digits is odd.

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

The square root of 166015243 is about 12884.6902562693. The cubic root of 166015243 is about 549.6032874756.

The spelling of 166015243 in words is "one hundred sixty-six million, fifteen thousand, two hundred forty-three".