636320454361 has 2 divisors, whose sum is σ = 636320454362. Its totient is φ = 636320454360.

The previous prime is 636320454331. The next prime is 636320454383. The reversal of 636320454361 is 163454023636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 616116674761 + 20203779600 = 784931^2 + 142140^2 .

It is a cyclic number.

It is not a de Polignac number, because 636320454361 - 2³¹ = 634172970713 is a prime.

It is not a weakly prime, because it can be changed into another prime (636320454311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318160227180 + 318160227181.

It is an arithmetic number, because the mean of its divisors is an integer number (318160227181).

Almost surely, 2^636320454361 is an apocalyptic number.

It is an amenable number.

636320454361 is a deficient number, since it is larger than the sum of its proper divisors (1).

636320454361 is an equidigital number, since it uses as much as digits as its factorization.

636320454361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 43.

Adding to 636320454361 its reverse (163454023636), we get a palindrome (799774477997).

The spelling of 636320454361 in words is "six hundred thirty-six billion, three hundred twenty million, four hundred fifty-four thousand, three hundred sixty-one".