420206642393 has 2 divisors, whose sum is σ = 420206642394. Its totient is φ = 420206642392.

The previous prime is 420206642369. The next prime is 420206642441. The reversal of 420206642393 is 393246602024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 311756955904 + 108449686489 = 558352^2 + 329317^2 .

It is a cyclic number.

It is not a de Polignac number, because 420206642393 - 2²⁶ = 420139533529 is a prime.

It is a super-2 number, since 2×420206642393² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 420206642393.

It is not a weakly prime, because it can be changed into another prime (420206642363) 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 as a sum of consecutive naturals, namely, 210103321196 + 210103321197.

It is an arithmetic number, because the mean of its divisors is an integer number (210103321197).

Almost surely, 2^420206642393 is an apocalyptic number.

It is an amenable number.

420206642393 is a deficient number, since it is larger than the sum of its proper divisors (1).

420206642393 is an equidigital number, since it uses as much as digits as its factorization.

420206642393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 41.

The spelling of 420206642393 in words is "four hundred twenty billion, two hundred six million, six hundred forty-two thousand, three hundred ninety-three".