166447 has 4 divisors (see below), whose sum is σ = 176256. Its totient is φ = 156640.

The previous prime is 166429. The next prime is 166457. The reversal of 166447 is 744661.

166447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 166447 - 2⁷ = 166319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4879 + ... + 4912.

It is an arithmetic number, because the mean of its divisors is an integer number (44064).

2¹⁶⁶⁴⁴⁷ is an apocalyptic number.

166447 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

166447 is a deficient number, since it is larger than the sum of its proper divisors (9809).

166447 is an equidigital number, since it uses as much as digits as its factorization.

166447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9808.

The product of its digits is 4032, while the sum is 28.

The square root of 166447 is about 407.9791661347. The cubic root of 166447 is about 55.0079327401.

It can be divided in two parts, 1664 and 47, that added together give a triangular number (1711 = T₅₈).

The spelling of 166447 in words is "one hundred sixty-six thousand, four hundred forty-seven".