398780831633 has 2 divisors, whose sum is σ = 398780831634. Its totient is φ = 398780831632.

The previous prime is 398780831591. The next prime is 398780831671. The reversal of 398780831633 is 336138087893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 396274027009 + 2506804624 = 629503^2 + 50068^2 .

It is a cyclic number.

It is not a de Polignac number, because 398780831633 - 2⁸ = 398780831377 is a prime.

It is not a weakly prime, because it can be changed into another prime (398780830633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199390415816 + 199390415817.

It is an arithmetic number, because the mean of its divisors is an integer number (199390415817).

Almost surely, 2^398780831633 is an apocalyptic number.

It is an amenable number.

398780831633 is a deficient number, since it is larger than the sum of its proper divisors (1).

398780831633 is an equidigital number, since it uses as much as digits as its factorization.

398780831633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15676416, while the sum is 59.

The spelling of 398780831633 in words is "three hundred ninety-eight billion, seven hundred eighty million, eight hundred thirty-one thousand, six hundred thirty-three".