163645 has 8 divisors (see below), whose sum is σ = 205056. Its totient is φ = 125136.

The previous prime is 163643. The next prime is 163661. The reversal of 163645 is 546361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163645 - 2¹ = 163643 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 (163643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 597 + ... + 826.

It is an arithmetic number, because the mean of its divisors is an integer number (25632).

2¹⁶³⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

163645 is a deficient number, since it is larger than the sum of its proper divisors (41411).

163645 is a wasteful number, since it uses less digits than its factorization.

163645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451.

The product of its digits is 2160, while the sum is 25.

The square root of 163645 is about 404.5305921683. The cubic root of 163645 is about 54.6975129965.

It can be divided in two parts, 1636 and 45, that added together give a square (1681 = 41²).

The spelling of 163645 in words is "one hundred sixty-three thousand, six hundred forty-five".