398935218667 has 2 divisors, whose sum is σ = 398935218668. Its totient is φ = 398935218666.

The previous prime is 398935218659. The next prime is 398935218763. The reversal of 398935218667 is 766812539893.

It is a weak prime.

It is an emirp because it is prime and its reverse (766812539893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398935218667 - 2³ = 398935218659 is a prime.

It is not a weakly prime, because it can be changed into another prime (398935218067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199467609333 + 199467609334.

It is an arithmetic number, because the mean of its divisors is an integer number (199467609334).

Almost surely, 2^398935218667 is an apocalyptic number.

398935218667 is a deficient number, since it is larger than the sum of its proper divisors (1).

398935218667 is an equidigital number, since it uses as much as digits as its factorization.

398935218667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 117573120, while the sum is 67.

The spelling of 398935218667 in words is "three hundred ninety-eight billion, nine hundred thirty-five million, two hundred eighteen thousand, six hundred sixty-seven".