398104664621 has 2 divisors, whose sum is σ = 398104664622. Its totient is φ = 398104664620.

The previous prime is 398104664519. The next prime is 398104664641. The reversal of 398104664621 is 126466401893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 332307284521 + 65797380100 = 576461^2 + 256510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398104664621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 398104664621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398104664641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199052332310 + 199052332311.

It is an arithmetic number, because the mean of its divisors is an integer number (199052332311).

Almost surely, 2^398104664621 is an apocalyptic number.

It is an amenable number.

398104664621 is a deficient number, since it is larger than the sum of its proper divisors (1).

398104664621 is an equidigital number, since it uses as much as digits as its factorization.

398104664621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1492992, while the sum is 50.

The spelling of 398104664621 in words is "three hundred ninety-eight billion, one hundred four million, six hundred sixty-four thousand, six hundred twenty-one".