398919085177 has 2 divisors, whose sum is σ = 398919085178. Its totient is φ = 398919085176.

The previous prime is 398919085171. The next prime is 398919085291. The reversal of 398919085177 is 771580919893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203275641321 + 195643443856 = 450861^2 + 442316^2 .

It is a cyclic number.

It is not a de Polignac number, because 398919085177 - 2⁷ = 398919085049 is a prime.

It is a super-2 number, since 2×398919085177² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (398919085171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199459542588 + 199459542589.

It is an arithmetic number, because the mean of its divisors is an integer number (199459542589).

Almost surely, 2^398919085177 is an apocalyptic number.

It is an amenable number.

398919085177 is a deficient number, since it is larger than the sum of its proper divisors (1).

398919085177 is an equidigital number, since it uses as much as digits as its factorization.

398919085177 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34292160, while the sum is 67.

The spelling of 398919085177 in words is "three hundred ninety-eight billion, nine hundred nineteen million, eighty-five thousand, one hundred seventy-seven".