166020543 has 16 divisors (see below), whose sum is σ = 264876640. Its totient is φ = 102166272.

The previous prime is 166020529. The next prime is 166020551. The reversal of 166020543 is 345020661.

166020543 is a `hidden beast` number, since 1 + 6 + 602 + 0 + 54 + 3 = 666.

It is not a de Polignac number, because 166020543 - 2⁴ = 166020527 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166020583) 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 15 ways as a sum of consecutive naturals, for example, 236146 + ... + 236847.

It is an arithmetic number, because the mean of its divisors is an integer number (16554790).

Almost surely, 2^166020543 is an apocalyptic number.

166020543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

166020543 is a deficient number, since it is larger than the sum of its proper divisors (98856097).

166020543 is a wasteful number, since it uses less digits than its factorization.

166020543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473015 (or 473009 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 166020543 is about 12884.8959250744. The cubic root of 166020543 is about 549.6091360679.

The spelling of 166020543 in words is "one hundred sixty-six million, twenty thousand, five hundred forty-three".