166541543 has 12 divisors (see below), whose sum is σ = 196390080. Its totient is φ = 140791392.

The previous prime is 166541533. The next prime is 166541569. The reversal of 166541543 is 345145661.

It is not a de Polignac number, because 166541543 - 2²⁰ = 165492967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166541533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19703 + ... + 26856.

It is an arithmetic number, because the mean of its divisors is an integer number (16365840).

Almost surely, 2^166541543 is an apocalyptic number.

166541543 is a deficient number, since it is larger than the sum of its proper divisors (29848537).

166541543 is an equidigital number, since it uses as much as digits as its factorization.

166541543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46646 (or 46639 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

The square root of 166541543 is about 12905.0975587169. The cubic root of 166541543 is about 550.1834572567.

The spelling of 166541543 in words is "one hundred sixty-six million, five hundred forty-one thousand, five hundred forty-three".