63813899509 has 2 divisors, whose sum is σ = 63813899510. Its totient is φ = 63813899508.

The previous prime is 63813899477. The next prime is 63813899557. The reversal of 63813899509 is 90599831836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56037305284 + 7776594225 = 236722^2 + 88185^2 .

It is a cyclic number.

It is not a de Polignac number, because 63813899509 - 2⁵ = 63813899477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63813893509) 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, 31906949754 + 31906949755.

It is an arithmetic number, because the mean of its divisors is an integer number (31906949755).

Almost surely, 2^63813899509 is an apocalyptic number.

It is an amenable number.

63813899509 is a deficient number, since it is larger than the sum of its proper divisors (1).

63813899509 is an equidigital number, since it uses as much as digits as its factorization.

63813899509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12597120, while the sum is 61.

The spelling of 63813899509 in words is "sixty-three billion, eight hundred thirteen million, eight hundred ninety-nine thousand, five hundred nine".