166667447 has 4 divisors (see below), whose sum is σ = 166710840. Its totient is φ = 166624056.

The previous prime is 166667401. The next prime is 166667467. The reversal of 166667447 is 744766661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166667447 - 2⁶ = 166667383 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 (166667467) 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 3 ways as a sum of consecutive naturals, for example, 15308 + ... + 23825.

It is an arithmetic number, because the mean of its divisors is an integer number (41677710).

Almost surely, 2^166667447 is an apocalyptic number.

166667447 is a deficient number, since it is larger than the sum of its proper divisors (43393).

166667447 is an equidigital number, since it uses as much as digits as its factorization.

166667447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43392.

The product of its digits is 1016064, while the sum is 47.

The square root of 166667447 is about 12909.9747095027. The cubic root of 166667447 is about 550.3220670157.

The spelling of 166667447 in words is "one hundred sixty-six million, six hundred sixty-seven thousand, four hundred forty-seven".