420556163 has 2 divisors, whose sum is σ = 420556164. Its totient is φ = 420556162.

The previous prime is 420556153. The next prime is 420556177. The reversal of 420556163 is 361655024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420556163 - 2²⁰ = 419507587 is a prime.

It is not a weakly prime, because it can be changed into another prime (420556153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210278081 + 210278082.

It is an arithmetic number, because the mean of its divisors is an integer number (210278082).

Almost surely, 2^420556163 is an apocalyptic number.

420556163 is a deficient number, since it is larger than the sum of its proper divisors (1).

420556163 is an equidigital number, since it uses as much as digits as its factorization.

420556163 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 420556163 is about 20507.4660306923. The cubic root of 420556163 is about 749.2176511538.

The spelling of 420556163 in words is "four hundred twenty million, five hundred fifty-six thousand, one hundred sixty-three".