398745598961 has 2 divisors, whose sum is σ = 398745598962. Its totient is φ = 398745598960.

The previous prime is 398745598957. The next prime is 398745599003. The reversal of 398745598961 is 169895547893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 303970282225 + 94775316736 = 551335^2 + 307856^2 .

It is a cyclic number.

It is not a de Polignac number, because 398745598961 - 2² = 398745598957 is a prime.

It is not a weakly prime, because it can be changed into another prime (398745598261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199372799480 + 199372799481.

It is an arithmetic number, because the mean of its divisors is an integer number (199372799481).

Almost surely, 2^398745598961 is an apocalyptic number.

It is an amenable number.

398745598961 is a deficient number, since it is larger than the sum of its proper divisors (1).

398745598961 is an equidigital number, since it uses as much as digits as its factorization.

398745598961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 587865600, while the sum is 74.

The spelling of 398745598961 in words is "three hundred ninety-eight billion, seven hundred forty-five million, five hundred ninety-eight thousand, nine hundred sixty-one".