166133243 has 4 divisors (see below), whose sum is σ = 166733280. Its totient is φ = 165533208.

The previous prime is 166133239. The next prime is 166133273. The reversal of 166133243 is 342331661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342331661 = 7 ⋅48904523.

It is a cyclic number.

It is not a de Polignac number, because 166133243 - 2² = 166133239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166133213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 299603 + ... + 300156.

It is an arithmetic number, because the mean of its divisors is an integer number (41683320).

Almost surely, 2^166133243 is an apocalyptic number.

166133243 is a deficient number, since it is larger than the sum of its proper divisors (600037).

166133243 is an equidigital number, since it uses as much as digits as its factorization.

166133243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600036.

The product of its digits is 7776, while the sum is 29.

The square root of 166133243 is about 12889.2685207501. The cubic root of 166133243 is about 549.7334719643.

The spelling of 166133243 in words is "one hundred sixty-six million, one hundred thirty-three thousand, two hundred forty-three".