166543403 has 8 divisors (see below), whose sum is σ = 179626608. Its totient is φ = 153499104.

The previous prime is 166543393. The next prime is 166543423. The reversal of 166543403 is 304345661.

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 166543403 - 2⁴ = 166543387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166543403.

It is not an unprimeable number, because it can be changed into a prime (166543423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500 + ... + 18257.

It is an arithmetic number, because the mean of its divisors is an integer number (22453326).

Almost surely, 2^166543403 is an apocalyptic number.

166543403 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

166543403 is a deficient number, since it is larger than the sum of its proper divisors (13083205).

166543403 is a wasteful number, since it uses less digits than its factorization.

166543403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19453.

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

The square root of 166543403 is about 12905.1696230619. The cubic root of 166543403 is about 550.1855054693.

The spelling of 166543403 in words is "one hundred sixty-six million, five hundred forty-three thousand, four hundred three".