646125163 has 2 divisors, whose sum is σ = 646125164. Its totient is φ = 646125162.

The previous prime is 646125113. The next prime is 646125167. The reversal of 646125163 is 361521646.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646125163 is a prime.

It is not a weakly prime, because it can be changed into another prime (646125167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323062581 + 323062582.

It is an arithmetic number, because the mean of its divisors is an integer number (323062582).

Almost surely, 2^646125163 is an apocalyptic number.

646125163 is a deficient number, since it is larger than the sum of its proper divisors (1).

646125163 is an equidigital number, since it uses as much as digits as its factorization.

646125163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 34.

The square root of 646125163 is about 25418.9921712093. The cubic root of 646125163 is about 864.5143734070.

The spelling of 646125163 in words is "six hundred forty-six million, one hundred twenty-five thousand, one hundred sixty-three".