645163 has 4 divisors (see below), whose sum is σ = 667440. Its totient is φ = 622888.

The previous prime is 645149. The next prime is 645179. The reversal of 645163 is 361546.

645163 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, and also an emirpimes, since its reverse is a distinct semiprime: 361546 = 2 ⋅180773.

It is a cyclic number.

It is not a de Polignac number, because 645163 - 2⁵ = 645131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645763) 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, 11095 + ... + 11152.

It is an arithmetic number, because the mean of its divisors is an integer number (166860).

2⁶⁴⁵¹⁶³ is an apocalyptic number.

645163 is a deficient number, since it is larger than the sum of its proper divisors (22277).

645163 is a wasteful number, since it uses less digits than its factorization.

645163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22276.

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

The square root of 645163 is about 803.2203931674. The cubic root of 645163 is about 86.4085036069.

It can be divided in two parts, 645 and 163, that added together give a palindrome (808).

The spelling of 645163 in words is "six hundred forty-five thousand, one hundred sixty-three".