166403543 has 8 divisors (see below), whose sum is σ = 170644320. Its totient is φ = 162171520.

The previous prime is 166403533. The next prime is 166403557. The reversal of 166403543 is 345304661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166403543 - 2⁸ = 166403287 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 (166403513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54563 + ... + 57531.

It is an arithmetic number, because the mean of its divisors is an integer number (21330540).

Almost surely, 2^166403543 is an apocalyptic number.

166403543 is a deficient number, since it is larger than the sum of its proper divisors (4240777).

166403543 is a wasteful number, since it uses less digits than its factorization.

166403543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4377.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 166403543 is about 12899.7497262544. The cubic root of 166403543 is about 550.0314505431.

The spelling of 166403543 in words is "one hundred sixty-six million, four hundred three thousand, five hundred forty-three".