420829898910809 has 2 divisors, whose sum is σ = 420829898910810. Its totient is φ = 420829898910808.

The previous prime is 420829898910797. The next prime is 420829898910913. The reversal of 420829898910809 is 908019898928024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 278299800582400 + 142530098328409 = 16682320^2 + 11938597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420829898910809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420829898910809.

It is not a weakly prime, because it can be changed into another prime (420829898940809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210414949455404 + 210414949455405.

It is an arithmetic number, because the mean of its divisors is an integer number (210414949455405).

Almost surely, 2^{420829898910809} is an apocalyptic number.

It is an amenable number.

420829898910809 is a deficient number, since it is larger than the sum of its proper divisors (1).

420829898910809 is an equidigital number, since it uses as much as digits as its factorization.

420829898910809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 429981696, while the sum is 77.

The spelling of 420829898910809 in words is "four hundred twenty trillion, eight hundred twenty-nine billion, eight hundred ninety-eight million, nine hundred ten thousand, eight hundred nine".