646204163 has 4 divisors (see below), whose sum is σ = 704950008. Its totient is φ = 587458320.

The previous prime is 646204147. The next prime is 646204177. The reversal of 646204163 is 361402646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 646204163 - 2⁴ = 646204147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646204133) 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, 29372906 + ... + 29372927.

It is an arithmetic number, because the mean of its divisors is an integer number (176237502).

Almost surely, 2^646204163 is an apocalyptic number.

646204163 is a deficient number, since it is larger than the sum of its proper divisors (58745845).

646204163 is a wasteful number, since it uses less digits than its factorization.

646204163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58745844.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 646204163 is about 25420.5460798937. The cubic root of 646204163 is about 864.5496059265.

The spelling of 646204163 in words is "six hundred forty-six million, two hundred four thousand, one hundred sixty-three".