398857853559169 has 2 divisors, whose sum is σ = 398857853559170. Its totient is φ = 398857853559168.

The previous prime is 398857853559107. The next prime is 398857853559197. The reversal of 398857853559169 is 961955358758893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 315530386080625 + 83327467478544 = 17763175^2 + 9128388^2 .

It is a cyclic number.

It is not a de Polignac number, because 398857853559169 - 2⁴³ = 390061760536961 is a prime.

It is a super-2 number, since 2×398857853559169² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (398857853529169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199428926779584 + 199428926779585.

It is an arithmetic number, because the mean of its divisors is an integer number (199428926779585).

Almost surely, 2^{398857853559169} is an apocalyptic number.

It is an amenable number.

398857853559169 is a deficient number, since it is larger than the sum of its proper divisors (1).

398857853559169 is an equidigital number, since it uses as much as digits as its factorization.

398857853559169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88179840000, while the sum is 91.

The spelling of 398857853559169 in words is "three hundred ninety-eight trillion, eight hundred fifty-seven billion, eight hundred fifty-three million, five hundred fifty-nine thousand, one hundred sixty-nine".