400553303993 has 2 divisors, whose sum is σ = 400553303994. Its totient is φ = 400553303992.

The previous prime is 400553303963. The next prime is 400553304007. The reversal of 400553303993 is 399303355004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 380544635689 + 20008668304 = 616883^2 + 141452^2 .

It is a cyclic number.

It is not a de Polignac number, because 400553303993 - 2¹² = 400553299897 is a prime.

It is not a weakly prime, because it can be changed into another prime (400553303933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200276651996 + 200276651997.

It is an arithmetic number, because the mean of its divisors is an integer number (200276651997).

Almost surely, 2^400553303993 is an apocalyptic number.

It is an amenable number.

400553303993 is a deficient number, since it is larger than the sum of its proper divisors (1).

400553303993 is an equidigital number, since it uses as much as digits as its factorization.

400553303993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 656100, while the sum is 44.

Adding to 400553303993 its reverse (399303355004), we get a palindrome (799856658997).

The spelling of 400553303993 in words is "four hundred billion, five hundred fifty-three million, three hundred three thousand, nine hundred ninety-three".