166729 has 4 divisors (see below), whose sum is σ = 168084. Its totient is φ = 165376.

The previous prime is 166723. The next prime is 166739. The reversal of 166729 is 927661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 927661 = 7 ⋅132523.

It can be written as a sum of positive squares in 2 ways, for example, as 76729 + 90000 = 277^2 + 300^2 .

It is a cyclic number.

It is not a de Polignac number, because 166729 - 2⁷ = 166601 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 166729.

It is not an unprimeable number, because it can be changed into a prime (166723) 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, 472 + ... + 745.

It is an arithmetic number, because the mean of its divisors is an integer number (42021).

2¹⁶⁶⁷²⁹ is an apocalyptic number.

It is an amenable number.

166729 is a deficient number, since it is larger than the sum of its proper divisors (1355).

166729 is a wasteful number, since it uses less digits than its factorization.

166729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354.

The product of its digits is 4536, while the sum is 31.

The square root of 166729 is about 408.3246257575. The cubic root of 166729 is about 55.0389806309.

The spelling of 166729 in words is "one hundred sixty-six thousand, seven hundred twenty-nine".