646023163 has 2 divisors, whose sum is σ = 646023164. Its totient is φ = 646023162.

The previous prime is 646023151. The next prime is 646023173. The reversal of 646023163 is 361320646.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646023163 is a prime.

It is not a weakly prime, because it can be changed into another prime (646023173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323011581 + 323011582.

It is an arithmetic number, because the mean of its divisors is an integer number (323011582).

Almost surely, 2^646023163 is an apocalyptic number.

646023163 is a deficient number, since it is larger than the sum of its proper divisors (1).

646023163 is an equidigital number, since it uses as much as digits as its factorization.

646023163 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 646023163 is about 25416.9857182161. The cubic root of 646023163 is about 864.4688790706.

The spelling of 646023163 in words is "six hundred forty-six million, twenty-three thousand, one hundred sixty-three".