166543247 has 6 divisors (see below), whose sum is σ = 180339912. Its totient is φ = 153732072.

The previous prime is 166543229. The next prime is 166543261. The reversal of 166543247 is 742345661.

It is a happy number.

It is not a de Polignac number, because 166543247 - 2⁶ = 166543183 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 166543247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166543217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 492563 + ... + 492900.

It is an arithmetic number, because the mean of its divisors is an integer number (30056652).

Almost surely, 2^166543247 is an apocalyptic number.

166543247 is a deficient number, since it is larger than the sum of its proper divisors (13796665).

166543247 is an equidigital number, since it uses as much as digits as its factorization.

166543247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985489 (or 985476 counting only the distinct ones).

The product of its digits is 120960, while the sum is 38.

The square root of 166543247 is about 12905.1635789710. The cubic root of 166543247 is about 550.1853336843.

The spelling of 166543247 in words is "one hundred sixty-six million, five hundred forty-three thousand, two hundred forty-seven".