6445163 has 4 divisors (see below), whose sum is σ = 6667440. Its totient is φ = 6222888.

The previous prime is 6445151. The next prime is 6445169. The reversal of 6445163 is 3615446.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3615446 = 2 ⋅1807723.

It is a cyclic number.

It is not a de Polignac number, because 6445163 - 2⁴ = 6445147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 222247 = 6445163 / (6 + 4 + 4 + 5 + 1 + 6 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6445169) 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, 111095 + ... + 111152.

It is an arithmetic number, because the mean of its divisors is an integer number (1666860).

Almost surely, 2^6445163 is an apocalyptic number.

6445163 is a deficient number, since it is larger than the sum of its proper divisors (222277).

6445163 is a wasteful number, since it uses less digits than its factorization.

6445163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222276.

The product of its digits is 8640, while the sum is 29.

The square root of 6445163 is about 2538.7325577934. The cubic root of 6445163 is about 186.0992552302.

The spelling of 6445163 in words is "six million, four hundred forty-five thousand, one hundred sixty-three".