398826082661 has 2 divisors, whose sum is σ = 398826082662. Its totient is φ = 398826082660.

The previous prime is 398826082621. The next prime is 398826082709. The reversal of 398826082661 is 166280628893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 376988632036 + 21837450625 = 613994^2 + 147775^2 .

It is a cyclic number.

It is not a de Polignac number, because 398826082661 - 2³⁰ = 397752340837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 398826082661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398826082601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199413041330 + 199413041331.

It is an arithmetic number, because the mean of its divisors is an integer number (199413041331).

Almost surely, 2^398826082661 is an apocalyptic number.

It is an amenable number.

398826082661 is a deficient number, since it is larger than the sum of its proper divisors (1).

398826082661 is an equidigital number, since it uses as much as digits as its factorization.

398826082661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11943936, while the sum is 59.

The spelling of 398826082661 in words is "three hundred ninety-eight billion, eight hundred twenty-six million, eighty-two thousand, six hundred sixty-one".