646610163 has 8 divisors (see below), whose sum is σ = 867131088. Its totient is φ = 428581344.

The previous prime is 646610143. The next prime is 646610203. The reversal of 646610163 is 361016646.

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

It is not a de Polignac number, because 646610163 - 2⁸ = 646609907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646610143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 622420 + ... + 623457.

It is an arithmetic number, because the mean of its divisors is an integer number (108391386).

Almost surely, 2^646610163 is an apocalyptic number.

646610163 is a deficient number, since it is larger than the sum of its proper divisors (220520925).

646610163 is a wasteful number, since it uses less digits than its factorization.

646610163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246053.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 646610163 is about 25428.5304923427. The cubic root of 646610163 is about 864.7306290329.

The spelling of 646610163 in words is "six hundred forty-six million, six hundred ten thousand, one hundred sixty-three".