167645 has 4 divisors (see below), whose sum is σ = 201180. Its totient is φ = 134112.

The previous prime is 167641. The next prime is 167663. The reversal of 167645 is 546761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546761 = 503 ⋅1087.

It can be written as a sum of positive squares in 2 ways, for example, as 81796 + 85849 = 286^2 + 293^2 .

It is a cyclic number.

It is not a de Polignac number, because 167645 - 2² = 167641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (167641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16760 + ... + 16769.

It is an arithmetic number, because the mean of its divisors is an integer number (50295).

2¹⁶⁷⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

167645 is a deficient number, since it is larger than the sum of its proper divisors (33535).

167645 is an equidigital number, since it uses as much as digits as its factorization.

167645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33534.

The product of its digits is 5040, while the sum is 29.

The square root of 167645 is about 409.4447459670. Note that the first 3 decimals coincide. The cubic root of 167645 is about 55.1395903228.

The spelling of 167645 in words is "one hundred sixty-seven thousand, six hundred forty-five".