63917812513 has 2 divisors, whose sum is σ = 63917812514. Its totient is φ = 63917812512.

The previous prime is 63917812507. The next prime is 63917812547. The reversal of 63917812513 is 31521871936.

It is a happy number.

63917812513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38487769489 + 25430043024 = 196183^2 + 159468^2 .

It is a cyclic number.

It is not a de Polignac number, because 63917812513 - 2⁹ = 63917812001 is a prime.

It is not a weakly prime, because it can be changed into another prime (63917816513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31958906256 + 31958906257.

It is an arithmetic number, because the mean of its divisors is an integer number (31958906257).

Almost surely, 2^63917812513 is an apocalyptic number.

It is an amenable number.

63917812513 is a deficient number, since it is larger than the sum of its proper divisors (1).

63917812513 is an equidigital number, since it uses as much as digits as its factorization.

63917812513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 46.

The spelling of 63917812513 in words is "sixty-three billion, nine hundred seventeen million, eight hundred twelve thousand, five hundred thirteen".