166643241 has 4 divisors (see below), whose sum is σ = 222190992. Its totient is φ = 111095492.

The previous prime is 166643237. The next prime is 166643291. The reversal of 166643241 is 142346661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166643241 - 2² = 166643237 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166643201) 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, 27773871 + ... + 27773876.

It is an arithmetic number, because the mean of its divisors is an integer number (55547748).

Almost surely, 2^166643241 is an apocalyptic number.

It is an amenable number.

166643241 is a deficient number, since it is larger than the sum of its proper divisors (55547751).

166643241 is an equidigital number, since it uses as much as digits as its factorization.

166643241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55547750.

The product of its digits is 20736, while the sum is 33.

The square root of 166643241 is about 12909.0371833069. The cubic root of 166643241 is about 550.2954236587.

The spelling of 166643241 in words is "one hundred sixty-six million, six hundred forty-three thousand, two hundred forty-one".