646118163 has 6 divisors (see below), whose sum is σ = 933281804. Its totient is φ = 430745436.

The previous prime is 646118147. The next prime is 646118183. The reversal of 646118163 is 361811646.

646118163 is a `hidden beast` number, since 646 + 1 + 1 + 8 + 1 + 6 + 3 = 666.

646118163 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 646118163 - 2⁴ = 646118147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646118113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35895445 + ... + 35895462.

Almost surely, 2^646118163 is an apocalyptic number.

646118163 is a deficient number, since it is larger than the sum of its proper divisors (287163641).

646118163 is a wasteful number, since it uses less digits than its factorization.

646118163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71790913 (or 71790910 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 646118163 is about 25418.8544785165. The cubic root of 646118163 is about 864.5112513997.

The spelling of 646118163 in words is "six hundred forty-six million, one hundred eighteen thousand, one hundred sixty-three".